Ancient Astronaut Theory has existed in popular culture for nearly 50 years, asking the question whether extraterrestrials visited Earth in the remote past. Find out more in Season 1, Episode 10, "The Alien Code." #InSearchOfAliens Subscribe for more HISTORY: ...

Is it possible that shadow people, spirits, poltergeists, and other enigmatic entities are rooted in reality? See more in this scene from Season 2, Episode 12, "Aliens and the Unseen." Watch all new episodes of Ancient Aliens, Fridays at 9/8c, and stay up to date on all of your favorite shows ...

Has time travel existed for centuries? See more in this compilation from Ancient Aliens. 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 HISTORY Channel ...

Are sacred places the product of man's reverence for God--or the result of contact with ancient space travelers? See more in this scene from Season 3, Episode 3, "Aliens and Sacred Places." Watch all new episodes of Ancient Aliens, Fridays at 9/8c, and stay up to date on all of your favorite ...

These cloud formations are looking a little suspicious. See more in this compilation from The Proof Is Out There. 0:00 Cloud Covered UFO 6:12 UFO Cloud 11:29 Angelic Cloud Formations Watch all new episodes of The Proof Is Out There, Fridays at 10/9c, and stay up to date on all of your ...

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 ...

Did you know that there's a network of private citizens that investigate UFOs? See more in this scene from Season 19, Episode 5, "The MUFON Files." Watch all new episodes of Ancient Aliens, Fridays, at 9/8c, and next day on The HISTORY Channel website at http://history.com/schedule. ...

Check out these extra creepy creatures, in this The Proof Is Out There compilation. 0:00 - Petrified Mystery Animal 4:34 - Grotesque Alyoshenka 9:18 - Inexplicable Brazilian Giant Ground Sloths 14:16 - Creepy Worm Clusters #TheProofIsOutThere Subscribe for more from The Proof Is Out There ...

Could these artifacts really have extraterrestrial origins? See more in this compilation from Ancient Aliens! 00:00 - Impossible Artifacts Possess an Extraterrestrial Connection 02:12 - Mysterious 2,000-Year-Old Skull Linked to Alien Life 07:40 - Ancient Artifacts Extraterrestrial Origins ...

Is this bizarre-looking shark the result of radiation effects? See more in this scene from Season 1, Episode 5, "Sea Creatures." Love watching The Proof Is Out There: Bermuda Triangle Edition? Stay up to date on all of your favorite The HISTORY Channel shows at history.com/schedule. ...

Are there electromagnetic waves being generated by the Great Pyramids? See more in this scene from Season 19, Episode 4, "The Power of the Obelisks." Watch all new episodes of Ancient Aliens, Fridays, at 9/8c, and next day on The HISTORY Channel website at http://history.com/schedule. ...

You won't believe these unsolved mysteries from Asia. See more in this compilation from The Proof Is Out There. 00:00 UFO or Weapon in Mongolia? 05:25 North Korean Super Soldier 10:33 Globster Seen in Indonesia 14:36 Plane Seen Rotating Watch all your favorite episodes of The Proof Is ...