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In this video clip, learn about Mardi Gras and the history behind it. Mardi Gras, or Fat Tuesday, comes from different Pagan traditions. It was later made into a Christian holiday.

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In this video clip, learn about Mardi Gras and the Mardi Gras parade Krewes. Parade Krewes are groups of people that go on floats and who have a section in the parade. Also learn about the history of the Mardi Gras parade.

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Discover how the bloodiest war in American history transformed the face of the nation.

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Though it does not contain cocoa solids, white chocolate was adopted into the chocolate family in 2004.

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Modern Marvels shows you three things you didn't know about your favorite sweet treat: chocolate

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Find out why the battle of the Alamo still captures the imaginations of Americans after more than two centuries.

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Elected in 1933, Franklin D. Roosevelt was a reassuring presence for many Americans through the trials of the Great Depression.

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How did George Washington turn a rag-tag group of men into a disciplined fighting machine?

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Born a slave, Harriett Tubman became a famous "conductor" on the Underground Railroad, leading hundreds of slaves to freedom.

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On August 28, 1963, a quarter million people gather to support civil rights, and share Dr. King's "dream" of equality.

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A quick look at the holiest day on the Christian calender.

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Green was not the first color associated with St. Patrick, so just how did green come to represent this holiday?

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To many in the Continental Congress, war was unthinkable. So why did they finally create this revolutionary document?

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How did George Washington turn a rag-tag group of men into a disciplined fighting machine?

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Shots fired by British soldiers in the streets of Boston in 1770 would spark the American Revolution.

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A fatal lack of ammunition dooms the colonists chances in an early American Revolutionary battle near Boston.

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As British General William Howe anticipates surrender, General Washington fleas across the East River under cover of darkness.

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By Christmas, 1777, in desperate need of a victory, Washington defies military convention with a nighttime assault in the dead of winter.

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In 1771, a group of colonists protest thirteen years of increasing British oppression, by attacking merchant ships in Boston Harbor. In retaliation, the British close the port, and inflict even harsher penalties.

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In April 1775, when British troops are sent to confiscate colonial weapons, they run into an untrained and angry militia. This ragtag army defeats 700 British soldiers and the surprise victory bolsters their confidence for the war ahead.

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At 33, Thomas Jefferson wrote the original draft of America's historic Declaration of Independence, which was approved by the Continental Congress after several days of debate and revisions on July 4, 1776.

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A two pronged attack by French & American forces defeats General Cornwallis in Virginia. Two years later, the Treaty of Paris will officially end the war

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Spoken word poet Staceyann Chin and actor Michael O'Malley read the words of Samuel DeWees, a soldier in Washington's army, as he tells the story of mutiny on the Pennsylvania line in 1781.

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What did George Washington really look like? This Mount Vernon video shows the forensic reconstruction of George Washington himself. With new technologies, we can find out what he looked like with the most accuracy since people who knew him.

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An unlikely pair whose tumultuous friendship lasted half a century, Thomas Jefferson and John Adams both died on July 4, 1826, 50 years after signing the Declaration of Independence.

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Thomas Jefferson is known for penning The Declaration of Independence, but some of his earlier writings establish the pattern of challenging the British monarchy.

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Shortly after gaining its independence, the United States goes to war with England over its seizure of U.S. ships and sailors.

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George Washington was an ambitious young man who strove to refine his character.

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General George Washington led a starving army in frigid conditions to victory at Valley Forge.

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In a History of the Holidays video, discover how and when Americans celebrated Independence Day in the past. Although Benjamin Franklin thought we'd celebrate the 2nd of July; the 4th of July is closest to our hearts.

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James Madison is considered to be the "Father of the Constitution," but it was the War of 1812 that ultimately defined his presidency.

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Hear the tale of how first lady Dolley Madison risked her life to save George Washington's portrait from a fiery fate as British troops approached the White House.

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At just 5'4", James Madison was hardly a commanding presence, but that didn't stop him from shaping American history.

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How did the siege at Fort McHenry play an integral part of US history? Why is Fort McHenry such an important part of the US overcoming British rule? Learn the answers to these questions and more at History.com.

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What you think you know about the Civil War may not be the whole truth.

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The Civil War saw the rise of major technological advances in warfare.

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Today he is known as one of the greatest American presidents, but at the time of his election no one would have predicted Lincoln's success.

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Find out what divided the men of the Civil War, and how in many ways they were more alike than different.

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Find out what event turned the tide of the Civil War.

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The Confederate general Stonewall Jackson was accidentally shot by his own men during a major Civil War battle, but it wasn't his wounds that killed him eight days later. How exactly did the commander die?

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Find out how the actions of a former Maine professor helped the Union win at Gettysburg, the deadliest battle of the Civil War.

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In the small Pennsylvania town of Gettysburg, 3,000 Union soldiers prepare to face the onslaught of 60,000 advancing Confederate soldiers.

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The Civil War was a long and gruesome conflict that claimed more than 620,000 lives and had lasting effects on military and civilian survivors.

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Federal Agent Felix Stidger infiltrated a Confederate terrorist organization called The Sons of Liberty and revealed terror plots against strategic Union targets.

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Confederate agents experiment with an early version of bio-warfare, attempting to spread yellow fever throughout Northern cities.

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Union Colonel Joshua Chamberlain and the 20th Maine Regiment make a daring downhill charge to defend Little Round Top at the Battle of Gettysburg.

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Biographer Liz Pryor reveals Robert E. Lee's greatest regret about his military career.

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Born a slave, Harriett Tubman became a famous "conductor" on the Underground Railroad, leading hundreds of slaves to freedom.

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The 54th Massachusetts Volunteer Infantry Regiment was one of the first official black units in the U.S. armed forces. Their courageous assault on Fort Wagner played a key role in bringing about an end to slavery.

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Issued after the Union vivtory at Antietam, the Emancipation Proclamation had both moral and strategic implications for the ongoing Civil War.

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Original or facsimile? The original Gettysburg Address bears creases in it it from when Abraham Lincoln placed it in his pocket.

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Lincoln's second inaugural address somberly intoned the sacrifices made to end slavery and preserve the Union while calling for mutual forgiveness between North and South as the work of rebuilding began.

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Abraham Lincoln's 1858 "House Divided" speech catapults him into the national consciousness with its bold moral assessment of the future of American slavery.

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A descendant of Ulysses S. Grant reveals an historical near miss that could have changed history.

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General Burnside takes Fredericksburg but experiences a disastrous defeat when attacking Confederate forces entrenched in the high ground above the town.

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At Shiloh, Tennessee in April of 1862, a Confederate surprise attack backfires when the Union holds firm at the "Hornet's Nest."

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Although best known for its role in the long slog of World War I, trench warfare actually got its start on the battlefields of the American Civil War. Find out how new weapons and technology played a part in both its development and destruction.

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An ill-fated assault on Turkish forces leads to 500,000 casualties in World War I.

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When Germany torpedoes a British passenger ship believed to be smuggling arms, anger at the resulting American deaths increases pressure on President Wilson to enter World War I.

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In this History Rewind video clip, take a step back in time to the beginning of World War 1. The repeated sinking of American ships caused the President to declare war. Watch the historic black and white footage of some of the attacks.

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Timothy Dickinson tells us about the life and death of the famous Russian mystic Rasputin.

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In this video clip, a veteran of World War I talks about what it was like to return home from the war. He talks about how they pulled into New York Harbor on Easter Sunday and they could see the Statue of Liberty.

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On June 6, 1944, Allied troops landed on the beaches of Normandy and turned the tides of World War II.

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On June 6, 1944, Allied troops invade German-occupied France and face near certain death on the beaches of Normandy.

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During WWII, Hitler's decentralized and paranoid military command structure spells disaster on the battlefield.

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After the D-Day invasion of France on June 6, 1944, the Allied advance is mired in the thick hedgerows of Normandy's bocage country.

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Rick Conte was surprised to find out that his father--an Army MP during World War II-- appeared briefly in a television documentary some 60 years after the war.

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Albert Fagler's grandfather was an Army Air Corps photographer during WWII and left behind film reels featuring dogfights and his own wedding.

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Tom Southwick's father caught amazing moments of life on a submarine on film as a naval photographer during World War II.

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Dawn Letson befriended a World War II veteran who was a member of the Women's Airforce Service Pilots (WASP) program, and shares her films from WASP training camp.

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Fred Linden's father was a PBY naval aviator during World War II and left behind two reels of film documenting his service in the South Pacific.

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In August 1945, the United States dropped two atomic bombs over the Japanese cities of Hiroshima and Nagasaki. What happened to people on the fringes of the blasts?

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In 1942, thousands of Japanese Americans living in the United States are forced into war relocation camps.

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In a costly battle, U.S. forces assault Peleliu in the Palau Islands to diminish its potential threat to their future invasions in the Pacific.

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As Allied troops move across Europe, they encounter the horror of thousands of prisoners in Nazi camps.

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In July 1942, the Nazi Army bombs the Soviet city of Stalingrad, launching one of the bloodiest battles in history.

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After Italy declares war, the Allies fight the Axis powers in North Africa for control of the Mediterranean.

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In December 1944, a major German offensive is launched against the Allies in the Ardennes Mountains region on the Western Front.

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The experiences of Bob Marken's father as a chaplain during WWII are preserved on films he left behind for his family.

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David Keran's grandfather was an OSS agent working with the French Resistance during WWII and left behind films of his experiences.

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The U.S. invades Kwajalein on January 31, 1944, breaking the outer ring of the Japanese Pacific territory.

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On February 19, 1945, American soldiers make their first strike on the Japanese Home Islands at Iwo Jima.

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First Lieutenant Shelby Westbrook enlisted in the U.S. Air Force and joined the nation's first all-black air corps shortly after Pearl Harbor. There he not only fought the enemy abroad, but worked hard to set an example for other African Americans struggling for equal rights.

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U.S. Army Sergeant Jack Werner was born in Austria in 1920 to a middle class Jewish family. in 1939 he fled Austria to escape Nazi persecution and soon joined the U.S. Army so he could help fight Hitler.

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This five-star general and 34th U.S. president launched the Space Race and created the federal interstate highway system.

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Rewind Breaking News The History Channel: Truman MacArthur Crisis. President Truman didn't want the Korean War to escalate, out of fear that the Soviet Union be drawn further into the conflict. This video clip is courtesy of The History Channel.

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In a Dogfights video, learn about Colonel Ralph S. Parr, one of the greatest jetfighter aces in American history. Parrs career in the United States Air Force lasted thirty-two years, while serving three wars and five combat tours.

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Veteran Sherman Pratt recalls the tough conditions during the Korean War.

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Veterans Frederick Blesse and Walker Mahurin P51 fighter jets during the korean War.

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For 30 years, the Berlin Wall was the defining symbol of the Cold War, separating families and keeping the people from jobs and opportunity in the west.

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Get the story of the dramatic face-off that nearly ended in nuclear war, as told by musician and artist Jeffrey Lewis.

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Explore the top-secret American project to build the world's first atomic bomb.

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Ronald Reagan galvanized the American public through his famous speeches that helped redefine American politics in the 1980s.

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Whether they volunteered or were drafted, 1 out of 10 soldiers did not survive Vietnam.

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In this video clip from Ask Steve, the reason for Americans interest in the Space Program was explored. It is explained that competition, and the technological wonder of the space race were some of the reasons for the Americans interest.

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Watch this interview clip of former U.S. President, Gerald Ford, about his views on war and President Bush. He claims President Bush has many more difficult decisions to make than he did while he was in office.

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For nearly 30 years, the Soviet Union is controlled by this ruthless tyrant, who sends millions to their death.

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Don Wildman explores a former submarine maintainence and weapons factory utilized during the Cold War.

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Don Wildman shows us a top secret military bunker built under Stalin's orders in 1952.

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John F. Kennedy's sets the goal of the United States to land a man on the moon and return him safely to Earth.

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In this Tech Effect video, brought to you by the History Channel, Buzz Aldrin talks about how competition with the Soviets in the 1960s spurred the American development of the Saturn V rocket and created excitement around the space program.

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Did the Vietnam War consume the presidency of Lyndon Johnson and ultimately break him? Find out more from noted journalists Carl Bernstein, Mike Wallace and other experts.

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"I remember that day, I was so full of fear about the ultimate showdown because we were being taught the implications of such a war between the U.S. and the Soviets, 90 miles from Miami, Florida..." From an interview with Jesse Jackson (March 6, 1991)

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President Kennedy's diplomatic resolve was tested as tension mounted at the Berlin wall.

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Rewind Breaking News The History Channel: This is the story of Ham, the first hominid to be launched into space. Ham the chimp is launched from Cape Canaveral, Florida in a Project Mercury Redstone rocket.

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This massive North Vietnamese surprise attack during the 1968 Tet holiday was a crucial turning point in the war.

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In 1969, Arthur Wiknik found himself in one of the Vietnam War's most notorious battles.

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A surprise phone call reunites two Vietnam war veterans, George Heady and Al Billings, with films of their service in the Navy Seawolves helicopter unit.

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Search and Destroy missions were a crucial part of the American war strategy in Vietnam.

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Marine Karl Marlantes left behind a Rhodes scholarship to volunteer for service in Vietnam.

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Bob Clewell dropped out of college to join the Army, and arrive in Vietnam just weeks after the Gulf of Tonkin incident in 1964. During his third tour, he was trained as a helicopter pilot, providing air support for ground troops during the Lam Son 719 offensive.

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Gery Benedetti was a member of the "Brown Water River Rats," whose missions were a crucial but dangerous component of the American combat operation in Vietnam.

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Reporter Joe Galloway covered the Vietnam War from the frontlines while embedded with the Command Unit of the 1st Cavalry Division.

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Fresh out of high school, Barry Romo enlisted in the U.S. Army to serve in Vietnam. Romo was awarded a bronze star for his efforts but grew disillusioned with the war and later joined a controversial group called Vietnam Veterans Against the War.

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Psychiatric nurse Elizabeth Allen volunteered for the Army and requested frontline duty in Vietnam.

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The guerilla warfare tactics of the North Vietnamese required U.S. military leaders to modify their combat strategy during the Vietnam War.

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Over 25 years, the Vietnam conflict escalated from an attempt to stop the spread of communism into a full-scale war.

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Originally intended as a temporary installation, the Eiffel Tower has become one of the most enduring symbols of France and the industrial age.

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The guillotine, the notorious killing machine of the French Revolution, was used to behead thousands, including King Louis XVI and Marie-Antoinette. Why was it a humane form of execution for its time, and did victims' brains continue functioning after decapitation?

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King Louis XVI and the French nobility face a revolution of the Third Estate.

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Small in stature, Napoleon Bonaparte left behind a huge legacy.

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Discover how the bloodiest war in American history transformed the face of the nation.

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WWI may have been the war to end all wars, but it was also the beginning of many military and civilian technologies.

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Step into the the excitement and chaos of the French Revolution as told by musician and artist Jeffrey Lewis.

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Whether they volunteered or were drafted, 1 out of 10 soldiers did not survive Vietnam.

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Athens' military campaign against the Peloponnesian League that eventually ended the Greek Golden Age, as told by musician and artist Jeffrey Lewis.

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The Samurai were fearsome warriors whose traditions of honor and discipline live on in the study of jujitsu and kendo today.

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Which of the admired Civil War generals would you want to lead your country?

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The Allies use double agents, code breakers and spies to undermine the German military throughout WWII, but cracking the Enigma code proves to be their greatest breakthrough.

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Michael Curry's grandfather was a medic during World War II and left behind meticulous notes to guide Michael through the films of his war experience.

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The general gains fame in World War II, then infamy when he is removed from his command in the Korean War.

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Judy Kent's neighbor, George Dibbs, was a combat photographer follwing General MacArthur during WWII and shared his films with her.

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Find out what divided the men of the Civil War, and how in many ways they were more alike than different.

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The Civil War saw the rise of major technological advances in warfare.

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America is at the brink of a Civil War as cotton spreads west and threatens to expand slavery into new territories.

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The guillotine, the notorious killing machine of the French Revolution, was used to behead thousands, including King Louis XVI and Marie-Antoinette. Why was it a humane form of execution for its time, and did victims' brains continue functioning after decapitation?

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The Roman leader Julius Caesar was stabbed 23 times by a mob of mutinous senators in 44 B.C. Could he possibly have survived long enough to utter his famous last words?

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The Confederate general Stonewall Jackson was accidentally shot by his own men during a major Civil War battle, but it wasn't his wounds that killed him eight days later. How exactly did the commander die?

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Get the story of the dramatic face-off that nearly ended in nuclear war, as told by musician and artist Jeffrey Lewis.

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On June 6, 1944, Allied troops invade German-occupied France and face near certain death on the beaches of Normandy.

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Though they could build complex suspension bridges, the Aztecs could not ward off diseases brought over by the Spanish.

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Musician and artist Jeffrey Lewis sings about the factors that brought down an empire.

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During WWII, Hitler's decentralized and paranoid military command structure spells disaster on the battlefield.

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Sixteen skilled shooters arrive from around the country to live together, put their marksmanship skills to the test, and compete for the $100,000 prize and title of Top Shot.

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Tom Southwick's father caught amazing moments of life on a submarine on film as a naval photographer during World War II.

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In September, 1943, Italy surrendered unconditionally to the Allies, while German forces quickly occupied north and central Italy. Aided by the Germans, Mussolini escaped from prison and established a puppet republic in northern Italy. Meanwhile, the new Italian government declared war on Germany, and Italy was recognized by the Allies as a cobelligerent. The Allied Italian campaign was a slow, grueling, and costly struggle. The fall of Rome in July, 1944 was followed by a stalemate. In April, 1945, partisans captured and summarily executed Mussolini. In May, 1945, the Germans surrendered.

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Since Aztecs introduced chocolate to Spanish explorers, it has spread around the world from Europe to the Hershey plant in West Hershey, PA.

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The Hershey plant in West Hershey, PA produces a variety of chocolate products.

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Explore the chemical reaction inside the brain when it encounters love.

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What happens inside your body when you are attracted to someone else?

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Famous Fat Dave creates an unforgettable box of chocolates for his special someone.

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Modern Marvels shows you three things you didn't know about your favorite sweet treat: chocolate

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Nancy Rosin is the president of the National Valentine Collector's Assocation and has close to 10,000 pieces in her personal collection. From the first mail-posted Valentine on record in 1806 to some of the precursors to today's Valentines, her collection is a chronicle of the world's social history of love.

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From Ireland's national symbol to its average beer consumption, get the facts on the Emerald Isle.

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Green was not the first color associated with St. Patrick, so just how did green come to represent this holiday?

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How did corned beef and cabbage become a St. Patrick's Day staple? It didn't start in Ireland.

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These mythological beings have appeared for centuries in Irish folklorethe pot of gold didn't come until much later.

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In this Holiday Foods video clip, we learn about what people traditionally eat during St. Patrick's Day. One of the most popular dishes is a hearty Irish Stew. Famous Fat Dave talks about the history of St. Patrick's Day and its traditions.

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In this Holiday Foods video clip, we learn about what people traditionally eat during St. Patrick's Day. The traditional meal that is eaten on St. Patrick's Day is corned beef and cabbage. Famous Fat Dave talks about the history of St. Patrick's Day.

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Did you know a woman invented Liquid paper? Find out more about women's contributions to science and technology.

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Get the unexpected stories behind some of the most famous women in the world of popular music.

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Find out the surprising stories of the unexpected ways women have served their countries in times of war.

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From her rough beginnings as an orphan, Madam CJ Walker went on to corner the market in black women's hair care and became the first self-made female millionaire.

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Discover the motivational stories of these inspiring African-American women.

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Marissa Tomei performs the words of a young factory girl preparing to strike.

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Marissa Tomei performs the words of a General Motors employee during a 1930s labor strike.

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From Sandra Day O'Connor to Shirley Chisholm to Madeleine Albright, these groundbreaking American women paved the way.

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In this video clip from Ask Steve, the birth control pill and the effect it had on the population was discussed. It sparked a sexual revolution, with a decline in the baby boom and recreational sex.

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In this video clip from The Naked Underground, Don Whitman is in Japan. He is dressed in a samurai suit, and participates in medieval combat with a female samurai. In the end, his loss means he has to pay honor to the female samurai.

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In this biography clip we see the early life of Sandra Day O'Connor. She was born during the Great Depression to Harry and Ada Day. She grow up on the Lazy B Ranch where she learned how to do ranch jobs from real cowboys.

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In an American Eats video, learn how the infamous Betty Crocker came to be and discover that America's favorite baking spokeswoman never actually existed.

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In this clip of The Mysteries of Amelia Earhart, hear personal views of what happened to the famous female pilot. Some say her plane crashed somewhere over the Pacific Ocean, while others say she was acting as a spy for the U.S. government.

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In this video clip from the show Act of Honor, we see the quinceanera of Karen Peralta. A quinceanera is a traditional Spanish celebration of a girl's fifteenth birthday.

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An excerpt from Barbara Jordan's keynote speech at the Democratic National Convection. Jordan was the first African-American woman ever elected to Congress from a southern state.

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Find out what happened to Violet Jessup, a stewardess aboard the Titanic and the only woman to survive the sinking of both the Titanic and her sister ship, Britannic.

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Angelou felt that Parks had greatness thrust upon her, achieved greatness, and was also born great. Parks' actions made for "a different world".

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On August 28, 1963, a quarter million people gather to support civil rights, and share Dr. King's "dream" of equality.

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Jackie Robinson's accomplishments on and off the field opens doors for all African Americans.

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From her rough beginnings as an orphan, Madam CJ Walker went on to corner the market in black women's hair care and became the first self-made female millionaire.

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Former Secretary of State Condoleeza Rice recalls her memories of Martin Luther King, Jr.

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Born a slave, Harriett Tubman became a famous "conductor" on the Underground Railroad, leading hundreds of slaves to freedom.

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After the carnage at the Battle of Gettysburg, Lincoln reaffirms his commitment to achieving freedom for all.

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The 761st Panther Tank division was called to duty in 1962.

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WWII veteran David Gilmore recalls his struggles during combat and the long road home.

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Newsreel footage of President Johnson signing the Voting Rights Bill.

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W.E.B. Dubois was integral to the advancement of racial equality.

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Malcolm X speaks to reporters about the Black Nationalist Movement and the need to establish Black Rifle Clubs.

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Stokely Carmichael, leader of the Student Nonviolent Coordinating Committee, spoke to a crowd in Greenwood, Mississippi in 1964.

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Newsreel footage of the freedom march from Selma to Montgomery, Alabama, led by Martin Luther King, Jr.

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Actor Forest Whitaker reflects on the legacy of Dr. Martin Luther King, Jr.

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Learn how blacks serving in WWII helped forward the Civil Rights Movement.

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Tom Brokaw talks about Martin Luther King, Jr.'s lasting effects on American Society.

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Bill Clinton speaks on his memories of Dr. Martin Luther King Jr.

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President Clinton invited Maya Angelou to read a poem during the 1993 inauguration ceremony.

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Jesse Jackson recalls standing in the rain with Dr. King in Selma, Alabama.

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Doxie Whitfield was a nurse in Atlanta in 1963 when the hospital floors were desegregated.

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Jesse Jackson remembers Martin Luther King Jr.'s reflective mood on the day he was assassinated.

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Silent footage of members of the 101st U.S. Airborne Division escorting the Little Rock Nine into Central High School on September 25, 1957.

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Jesse Jackson talks about Martin Luther King Jr.'s effect on the human race.

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With only 37 seconds to avoid disaster, could the Titanic crew have changed its course in time? Watch this clip to find out.

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Naval architect Roger Long breaks down Titanic's structure to gain better insight into how and why the "unsinkable" ship sank.

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The first to see the iceberg that would sink the unsinkable ship, Frederick Fleet held himself responsible for the fate of the ship and its passengers.

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As British General William Howe anticipates surrender, General Washington fleas across the East River under cover of darkness.

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In this American History video, brought to you by the History Channel, hall of fame NFL quarterback Len Dawson talks about his home state of Missouri and how it has some of the best sports in the world.

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Rewind Breaking News The History Channel: British Movietone covers one of the most famous weddings in history: the marriage of Prince Charles of Wales and Lady Diana Spencer. This video clip is courtesy of The History Channel.

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Braveheart used his knowledge of the countryside to defeat the British at Sterling Bridge.

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The Saxons continue to capture lands of the British aristocracy. During this time a prince emerges from the British. His name is Arthur, and Camelot begins.

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After Italy declares war, the Allies fight the Axis powers in North Africa for control of the Mediterranean.

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The Protestant Reformation encourages both religious and scientific thought.

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WWI may have been the war to end all wars, but it was also the beginning of many military and civilian technologies.

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Tobacco was the lifeblood of the early Southern colonies, and its profits led directly to the rapid growth of slavery in the new nation.

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English settlers arrived at Jamestown expecting riches to fall into their hands, but were soon faced with a much harsher reality.

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In a History Rewind video, on Coronation Day, a glittering spectacle in London is witnesses by millions. In the procession, Britain's prime minister Sir Winston Churchill is present, having served five monarchs.

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The Civil War saw the rise of major technological advances in warfare.

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What did the first-ever telegraph message--sent by the machine's inventor Samuel Morse in 1844--say? And is it true that Alexander Graham Bell was initially unable to find any buyers for his new invention, the telephone? Find out more.

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Morse's first telegram marked the beginning of the telecommunications revolution.

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After retiring from politics age 42, Ben Franklin became an innovator in the field of science through his study of electricity and his invention of the lightning rod.

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Twenty-four thousand miles of railroad replenishes troops and supplies for the North and delivers disaster to the South.

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Built during the Great Depression, Hoover Dam was a marvel of engineering and labor.

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The Gutenberg Bible was the first book printed in Western Europe using movable metal type, introducing text reproduction to the masses.

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The U.S. competition with the U.S.S.R. for technological dominance spurred the U.S. on to the first-ever landing on the Moon.

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Thomas Edison, father of the lighbulb and motion picture, was granted an astounding 400 patents in a prolific 8-year period. But not all his ideas were good ones.Find out about the Wizard of Menlo Park's most bizarre failed inventions. From Modern Marvels.

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In this video clip from Modern Marvels we learn about how penicillin became available to the masses. During World War II, the militaries were in desperate need of a drug that would cure infection. Penicillin was the answer.

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For decades, American children have loved Silly Putty; however, the orgins of this rubber-like substance date back to a time when the U.S. faced a major crisis. Find out how and when Silly Putty was invented. From Modern Marvels.

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Though they could build complex suspension bridges, the Aztecs could not ward off diseases brought over by the Spanish.

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The growth of the great Mayan civilization is as much a mystery as its disappearance.

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It was nearly wiped out during the eruption of Mount Vesuvius in 79 A.D. What is left of this ancient city and will Vesuvius erupt again? Uncover the lost city of Pompeii.

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Ten-thousand strong, the Spartan army was highly skilled and technologically advanced for its time.

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When Aztec priests made human sacrifices to their gods, they would tear out the victim's heart and hold it in the air. Would the heart really still be beating?

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Legend has it that Cleopatra took her own life by succumbing willingly to the bite of a cobra. If this story is true, was suicide by snake venom an easy way to go, or did the last Egyptian pharaoh die in excruciating pain?

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The Roman leader Julius Caesar was stabbed 23 times by a mob of mutinous senators in 44 B.C. Could he possibly have survived long enough to utter his famous last words?

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In 1988, scientists discovered an ancient ship that may have been sailed by Odysseus, Homer's legendary Greek King.

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Once a beautiful priestess to Athena, the Greek Goddess of war, Medusa is transformed into a hideous monster after she falls victim to a crime.

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Some believe an underground site on the island of Crete was the labyrinth of the Minotaur, Greek mythology's vicious half-man, half-beast creature.

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When natural disasters struck, the ancient Greeks believed that Zeus, their god of all gods, showing anger and displeasure.

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When Aztec priests made human sacrifices to their gods, they would tear out the victim's heart and hold it in the air. Would the heart really still be beating?

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The Aztec pyramids hold many mysteries for modern day archaeologists.

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While many believe that the holiday of Cinco de Mayo is a celebration of Mexico's Independence Day, this is an incorrect assumption. To learn of the actual significance of Cinco de Mayo, watch this History of the Holidays video.

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In this Holiday Foods video clip, we go on an epic journey with host Famous Fat Dave. Join him as he tries to unlock the mystery of Cinco de Mayo's most unusual foodMole Poblano. See all the hilarious moments right here.

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In this Wonders of Latin America video, learn why hospitality was a fatal mistake for the Aztec empire. Montezuma and Cortez meet in a peaceful way but with tensions of two different worlds. Montezuma invites Cortez and his men to stay in one of his palaces.

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In this History Wonders video, brought to you by the History Channel, learn about the founding of the Aztec Empire in Tenochtitlan. The Aztecs really started to control the city when they defeated their overlords, the Tepanecs.

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In this Ancient Mysteries video clip we learn about the Aztec empire. In 1519 the explorer Hernan Cortez came to Aztec capital city of Tenochtitlan. An early prophecy was that a white man would return to rule in 1519.

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During the 1990s Mexico became ground zero for UFO sightings. This is some of the best evidence for UFOs caught on video.

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Honor was so much a part of Samurai life that warriors would commit ritual suicide if ever the code was broken.

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In this video clip from The Naked Underground, Don Whitman is in Japan. He is dressed in a samurai suit, and participates in medieval combat with a female samurai. In the end, his loss means he has to pay honor to the female samurai.

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After successfully passing the Ellis Island screening process, immigrants departed from the Ferry Building and started their new lives in America. What does the Ferry Building look like today? Find out more with a behind-the-scenes tour.

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What does Ellis Island look like today? Go behind the scenes with photographer Stephen Wilkes, who discusses the importance of light in his photographs of this place where millions of immigrants once passed through.

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Footage of immigrants entering Ellis Island in 1906.

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Immigrants arrive at Ellis Island in 1903.