Massive object travels at 500 MPH! See more in this scene from Season 20, Episode 8, "The UFO Superhighway." Watch your favorite episodes of Ancient Aliens on The HISTORY Channel website at http://history.com/schedule. #AncientAliens Subscribe for more from Ancient Aliens and other great The ...

What is the truth behind this mysterious lake monster? See more in this scene from Season 3, Episode 8. 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. #TheProofIsOutThere ...

In cultures throughout the world, there are tales of intimate encounters with otherworldly beings. But could these stories be more than just mythology? See more in Season 7, Episode 8, "Alien Breeders." Watch all new episodes of Ancient Aliens, Fridays, at 9/8c, and next day on The HISTORY ...

Sacred bones... Golden hats... And fragments of sacred objects thought to possess healing properties. All around the world, archaeologists have uncovered mysterious relics, in Season 6, Episode 8, "Mysterious Relics." #AncientAliens Subscribe for more from Ancient Aliens and other great The ...

Who are the Mysterious Nine, and what relationship do they have to the television show "Star Trek?" Discover the group's origins in this collection of scenes from "The Mysterious Nine." #AncientAliens Subscribe for more from Ancient Aliens and other great HISTORY shows: ...

Why is it that the number nine appears across the globe throughout history? Discover the origins of the group referred to as "The Mysterious Nine" in this preview. #AncientAliens Subscribe for more from Ancient Aliens and other great HISTORY shows: http://histv.co/SubscribeHistoryYT Find out ...