The History Channel

Angkor Wat, Cambodia, is the world's largest ancient religious temple. Within its megalithic ruins, researches have discovered a depiction of a species of dinosaur--a stegosaurus. But how could the ancients have had knowledge of animals that mainstream science says died out millions of years ago? Why are dinosaurs extinct? Did an alien race of beings kill off the dinosaurs to make room for humankind?

Might an examination of Leonardo Da Vinci's masterful paintings, highly technical hand-drawn sketches, and private journals reveal knowledge of otherworldly technology and extraterrestrial beings?

The Maya created the most sophisticated calendar systems in the ancient world, and according to many scholars their Long Count Calendar will come to an end on December 21, 2012. What does this mean for mankind? Some researchers believe it will usher in the return of Bolon Yokte--a mysterious god associated with creation and war. Could this god actually be an extraterrestrial as some ancient astronaut theorists believe? Other scholars believe the end of the calendar will bring about a series of catastrophic events that may threaten the very existence of mankind. They point to a rare galactic alignment that will coincide with the end of the Mayan calendar as proof of an impending geological catastrophe. If these doomsday prophecies prove to be true, will it mean the end of the world as we know it? Or could it reveal some profound truth about the origins of the human race?

People on every continent have claimed to see the footprints of Bigfoot. And ancient myths and legends speak of an ape-like giant stalking the earth. What if, as Ancient Astronaut theorists believe, there is evidence to connect Bigfoot with an alien species that once visited Earth in the distant past?

Modern Marvels is going big, and counting down. We take the "best of" Modern Marvels and give you the MEGA Top 10 countdown. On this edition, the top ten guilty pleasures you just can't resist... America's Favorite Foods.

Modern Marvels is going big, and counting down. We take the "best of" Modern Marvels and give you the MEGA Top 10 countdown. On this edition: Speed. It's a pure adrenaline rush as we race the top 10 fastest marvels we've featured down to the speediest of all.

Modern Marvels is going big, and counting down. We take the "best of" Modern Marvels and give you the MEGA Top 10 countdown. On this edition: Amazing Weapons. They're every arsenal's best asset and every enemy's worst nightmare and we're counting them down to the most amazing weapon of all.

Modern Marvels is going big, and counting down. We take the "best of" Modern Marvels and give you the MEGA Top 10 countdown. On this edition: Awe-Inspiring Machines--featuring the top ten mightiest, strangest, and most unique innovations from our archives.

The gadget: It's small enough to hold in your hands. It's mechanical or electronic, and mass-produced. It's a personal item that evolves from novelty to necessity--and ultimately shows its paradigm-shifting power. In this two-hour special, the editors of Popular Mechanics and a panel of experts join forces with HISTORY to rank the most influential inventions of the past 200 years and tell the surprising stories behind them.

Scotty takes on a tornado of dust, debris and itchy crap to test a product that its inventor hopes will make him millions. Then Reichart turns up the heat when the guys blast the invention with a torrent of fire. Will the inventor get the deal he's looking for or will he walk away feeling burned? Plus, another inventor believes he's created a must-have product for campers. But with a shot a big manufacturing deal on the line, Reichart and Scotty let the snakes decide if this invention is a winner or a loser.

All hail breaks loose in Texas, when Scotty and Reichart test a married couple's invention. It's designed to protect cars from damaging hailstorms. But, will it survive Scotty and Reichart's secret weapon? Then, the guys head to Maryland to meet an inventor with a million and one ideas. But will Scotty and Reichart find that one in a million that will lead the inventor to big bucks?

Hold onto your hips, as the Cajun Pawn Stars try to make a deal on a priceless timepiece once owned by the King himself, Elvis Presley. A famous Cajun boat sails into Johnnie's sights. And shop regular Joker tries to hunt down a deal when he brings in a furry friend.

Join the Cajun Pawn Stars as they head to the old west when a customer brings in a rare Lone Ranger collection. Shop regular Gerard tries to take Johnnie to the cleaners for a deal on an antique washing machine. And, Jimmie and Tammie bargain for a bronze bust of General George Custer, but will this faceoff end in a deal or defeat?

Informational programming.

Informational programming.

Informational programming.

Informational programming.

Informational programming.

Informational programming.

Events covered include: Survival (USS Indianapolis, Alexander Selkirk, the Donner Party); Fire (Triangle Shirtwaist Factory Fire, Eternal Flame of Rome, Royster Tire Fire); It's Mine, All Mine (largest private U.S. residence, most land owned by one man, biggest land grab); and Wind (first circumnavigation by a balloon, biggest windmill facility, the Zeppelin). The "most moment" covers "Black Tuesday", the stock market crash of 1929.

Modern Marvels is going big, and counting down. We take the "best of" Modern Marvels and give you the MEGA Top 10 countdown. On this edition, the top ten guilty pleasures you just can't resist... America's Favorite Foods.

Modern Marvels is going big, and counting down. We take the "best of" Modern Marvels and give you the MEGA Top 10 countdown. On this edition: Speed. It's a pure adrenaline rush as we race the top 10 fastest marvels we've featured down to the speediest of all.

Modern Marvels is going big, and counting down. We take the "best of" Modern Marvels and give you the MEGA Top 10 countdown. On this edition: Amazing Weapons. They're every arsenal's best asset and every enemy's worst nightmare and we're counting them down to the most amazing weapon of all.

Modern Marvels is going big, and counting down. We take the "best of" Modern Marvels and give you the MEGA Top 10 countdown. On this edition: Awe-Inspiring Machines--featuring the top ten mightiest, strangest, and most unique innovations from our archives.