Construction workers unearth evidence of a long-lost civilization in China. See more in this clip from "Aliens and Lost Civilizations." Watch all new episodes of Ancient Aliens, Fridays, at 9/8c, and next day on The HISTORY Channel website at http://history.com/schedule. #AncientAliens ...

Check out these baffling UFO sightings, in this The Proof Is Out There compilation. Chapter 1 - Wildfire UFO over Los Angeles? - 00:00 Chapter 2 - Strange Aircraft Seen in Space - 04:19 Chapter 3 - Fast-moving Scout Seen on Drone - 08:33 Chapter 4 - Fiery Unidentified Object in the Sky - ...

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People spot something very strange in the sky. See more in this clip from The Proof Is Out There. #TheProofIsOutThere Watch all your favorite episodes of The Proof Is Out There, and stay up to date on all of your favorite The HISTORY Channel shows at http://history.com/schedule. Subscribe ...

Spanish conquerors found thousands of Mayan handwritings that depicted secret rituals. See more in this clip from "Aliens and Lost Civilizations." Watch all new episodes of Ancient Aliens, Fridays, at 9/8c, and next day on The HISTORY Channel website at http://history.com/schedule. ...

Legends from around the world speak of sacred entryways to the land of the gods. Gates that allowed instant passage not just beyond the confines of Earth, but beyond space and time. See more in Season 7, Episode 1, "Aliens and Stargates." #AncientAliens Watch all new episodes of Ancient ...

Something unexpected happens when Apollo 12 hits the moon. See more in this clip from Ancient Aliens. Watch all new episodes of Ancient Aliens, Fridays, at 9/8c, and next day on The HISTORY Channel website at http://history.com/schedule. #AncientAliens Subscribe for more from Ancient Aliens ...

Strange lights illuminating from the bottom of the Bermuda Triangle may point to strange alien activity. See more in this clip from Season 1, "USOs & Underwater Forces." Love watching The Proof Is Out There: Bermuda Triangle Edition? Stay up to date on all of your favorite The HISTORY Channel ...

Check out these strange creatures in this The Proof Is Out There compilation. Chapter 1 - 00:00 - Alien with Long Limbs Spotted in Montana Chapter 2 - 04:57 - Sewer Snake Comes out of Toilet in Malaysia Chapter 3 - 09:23 - Velociraptor Looking Animal Caught on Camera in Florida?! Chapter 4 - ...

Two pyramids located on two different continents share uncanny features. See more in this clip from "Aliens and Unexplained Engineering." Watch all new episodes of Ancient Aliens, Fridays at 9/8c, and next day on The HISTORY Channel website at http://history.com/schedule. #AncientAliens ...

Ancient Astronaut Theorists reveal the original origins of the Aztec's. See more in this clip from "Aliens and Unexplained Engineering." Watch all new episodes of Ancient Aliens, Friday, January 6th, at 9/8c, and next day on The HISTORY Channel website at http://history.com/schedule. ...

Experts look into the exoplanet phenomena, in this clip from Ancient Aliens. Watch all new episodes of Ancient Aliens, Friday, January 6th, at 9/8c, and next day on The HISTORY Channel website at http://history.com/schedule. #AncientAliens Subscribe for more from Ancient Aliens and other ...