The History Channel

Geologist Scott Wolter visits a Minnesota farmer who wants to investigate the possible existence of bones from a giant he unearthed in his yard. The bones raise the question of whether Vikings could have traveled all the way to America.

Ancient Astronaut theorists believe aliens have been visiting earth for thousands of years. If so, might we find evidence of this even in the stories of America's Old West? In Aurora, Texas, the local cemetery claims to hold the body of an alien whose ship crashed there in 1897. In Utah, petroglyphs depict strange beings wearing what look like space suits. In southern California, 19th century ranchers reported seeing an otherworldly creature emerge from Elizabeth Lake. And even in Tombstone, Arizona, the home of Wyatt Earp and the site of the gunfight at the O.K. Corral, cowboys claimed to have shot at a giant, metallic bird Are these simply campfire tales, or did the cowboys and native people of America's Wild West actually come in contact with alien beings from another--much more distant--frontier?

You've got a cell phone at one ear, an iPod at the other. You know that Blackberry is now a verb and Spam is not only canned meat. But just how did we get here? Blame William Shatner--yes, that William Shatner--Captain Kirk. We'll boldly go where few have gone before to reveal how scientists, inspired by the series, would revolutionize medicine and are surpassing the far-out vision of the future foreshadowed in Star Trek in the 1960s. From cell phones to computers to even leading-edge medical advancements, this 2-hour special explores how those sci-fi inventions have now permeated everyday life as we know it. Hosted and narrated by Shatner and based on his book, I'm Working on That, we'll meet the brightest minds of Silicon Valley and the Trek-inspired inventions that have help change the world.

What if one of the most famous and terrifying urban legends was not a legend but a frightening fact? History tells us that Alligators lurking around in the sewers of New York City is based in truth. In the mid 1930s three teenagers pulled an eight-foot alligator from a storm drain. Reports persisted until a skeptical Superintendant of Sewers, Teddy May, was forced to investigate for himself. What May found shocked even him--swarms of alligators alive beneath the busy main street of America's biggest city. Crews were sent in to kill the deadly reptiles, but the stories of the gators in the sewers lived on. Experts, however, are divided over whether it is scientifically possible for alligators to continue to exist in the sewers, so a MonsterQuest team sets out to search for modern evidence of these monsters and prove that they could not only survive but also thrive.

Head deep into the Venezuela wilderness where there have been sightings of huge man-eating snakes--anaconda. For the first time ever an industrial acoustic sonar camera will be used to search for these monsters. The investigation will also search the Everglades of Florida where pet pythons have escaped and are multiplying and growing to huge sizes, preying on all kinds of animals, even swallowing a full grown alligator in one case. Could a human become their next victim?

Biblical texts and ancient lore frequently describe winged creatures carrying messages from the heavens. But are angels merely the product of mankind's imagination--or do they really exist? If so, where do they come from? Ancient astronaut theorists suggest that the Bible's Old Testament reads like a handbook on extraterrestrial visitations. Accounts of angels can also be found in Islamic and Indian texts. Infinite stories around the globe describe unearthly guardians, entrusted to both observe and protect as well as tales of powerful warriors bringing about everything from plague to peace. Are angels really supernatural beings from heaven, or something more? If so, might angels really be travelers--visiting Earth from distant planets?

Could gold be the ultimate link between humans and aliens? A church in southern France is said to hold the key to alchemy--and a gateway to another part of the universe. Locals in Cusco, Peru believe UFO sightings are connected to lost gold at the bottom of Lake Puray. And some believe underneath the Great Sphinx of Giza lies an entire library left behind by extraterrestrials--a library stored on gold.

Best-selling author Brad Meltzer and the team jump at the chance to take on one of the FBI's most puzzling unsolved crimes: the 1971 disappearance of airline skyjacker D.B. Cooper, who bailed out of a jetliner at ten thousand feet over Washington state with two parachutes and two hundred thousand dollars in ransom money strapped to his body. Working closely with the former FBI agent who headed up the unsuccessful search for Cooper, Brad and the team examine new evidence that points to a former airline employee named Kenny Christiansen, whose own brother suspects he was actually the skyjacker who called himself D.B. Cooper. This sets up a climactic meeting between the Decoded team and Christensen's possible accomplice, the man who may have helped D.B. Cooper and his two hundred thousand dollar ransom vanish into thin air.

The Declaration of Independence is the founding document of American Democracy. Could it contain hidden messages from our nation's forefathers intended to be discovered years later? Buddy, Mac and Scott travel across America to try and uncover the mysteries behind our nation's most prized document.

In 1990, the tomb of the High Priest Caiaphas was unearthed in Jerusalem. Along with inscribed "ossuaries" (bone boxes), two Roman nails were recorded in the official excavation report. However, the nails were not photographed, drawn, measured or widely publicized. Intrigued by the possibility of crucifixion nails in the tomb of the man who sent Jesus to the cross, filmmaker Simcha Jacobovici goes looking for them. He now finds that they have disappeared, and the tomb has literally been covered up. A dramatic investigation ensues. The goal is to find the missing artifacts and re-enter the tomb. Expect shocking revelations along the way.

Informational programming.

Informational programming.

Informational programming.

Informational programming.

Christianity is thought of as a religion of peace, not war. But in this episode Simcha Jacobovici reveals that the religion of love was spread by the Roman army. The investigation begins with a mysterious symbol found engraved on an ancient skull. The film then discovers the symbol on the walls of Roman army barracks, inscribed on amulets and on pillars of underground churches. From Pompeii to the farthest reaches of the Empire, in England and Syria, this episode reveals how Christianity secretly thrived within the very army that was supposed to suppress it.

You've got a cell phone at one ear, an iPod at the other. You know that Blackberry is now a verb and Spam is not only canned meat. But just how did we get here? Blame William Shatner--yes, that William Shatner--Captain Kirk. We'll boldly go where few have gone before to reveal how scientists, inspired by the series, would revolutionize medicine and are surpassing the far-out vision of the future foreshadowed in Star Trek in the 1960s. From cell phones to computers to even leading-edge medical advancements, this 2-hour special explores how those sci-fi inventions have now permeated everyday life as we know it. Hosted and narrated by Shatner and based on his book, I'm Working on That, we'll meet the brightest minds of Silicon Valley and the Trek-inspired inventions that have help change the world.

What if one of the most famous and terrifying urban legends was not a legend but a frightening fact? History tells us that Alligators lurking around in the sewers of New York City is based in truth. In the mid 1930s three teenagers pulled an eight-foot alligator from a storm drain. Reports persisted until a skeptical Superintendant of Sewers, Teddy May, was forced to investigate for himself. What May found shocked even him--swarms of alligators alive beneath the busy main street of America's biggest city. Crews were sent in to kill the deadly reptiles, but the stories of the gators in the sewers lived on. Experts, however, are divided over whether it is scientifically possible for alligators to continue to exist in the sewers, so a MonsterQuest team sets out to search for modern evidence of these monsters and prove that they could not only survive but also thrive.

Head deep into the Venezuela wilderness where there have been sightings of huge man-eating snakes--anaconda. For the first time ever an industrial acoustic sonar camera will be used to search for these monsters. The investigation will also search the Everglades of Florida where pet pythons have escaped and are multiplying and growing to huge sizes, preying on all kinds of animals, even swallowing a full grown alligator in one case. Could a human become their next victim?

Biblical texts and ancient lore frequently describe winged creatures carrying messages from the heavens. But are angels merely the product of mankind's imagination--or do they really exist? If so, where do they come from? Ancient astronaut theorists suggest that the Bible's Old Testament reads like a handbook on extraterrestrial visitations. Accounts of angels can also be found in Islamic and Indian texts. Infinite stories around the globe describe unearthly guardians, entrusted to both observe and protect as well as tales of powerful warriors bringing about everything from plague to peace. Are angels really supernatural beings from heaven, or something more? If so, might angels really be travelers--visiting Earth from distant planets?