Check out these groundbreaking time travel theories. See more in this Ancient Aliens compilation. 1) 0:00 2) 17:36 Watch all new episodes Fridays 9/8c; Stream Next Day, and stay up to date on all of your favorite shows on The HISTORY Channel website at http://history.com/schedule. ...

Could these mysterious flying objects be extraterrestrials? See more in this #Short from Ancient Aliens. Subscribe for more HISTORY: http://histv.co/SubscribeHistoryYT Check out exclusive HISTORY content: History Newsletter - https://histv.co/newsletter Website - https://histv.co/History ...

Check out these mysterious powers from above. See more in this Ancient Aliens marathon. Watch all new episodes Fridays 9/8c; Stream Next Day, and stay up to date on all of your favorite shows on The HISTORY Channel website at http://history.com/schedule. #AncientAliens Subscribe for more ...

Check out these mysterious sites. See more in this Ancient Aliens marathon. Watch all new episodes Fridays 9/8c; Stream Next Day, and stay up to date on all of your favorite shows on The HISTORY Channel website at http://history.com/schedule. #AncientAliens Subscribe for more from Ancient ...

Security camera catch an inexplicable UFO on tape, in this scene from Season 4, "The Return." New episodes of The Secret of Skinwalker Ranch, Tuesdays at 10/9c. Stay up to date on all your favorite The HISTORY Channel shows at http://history.com/schedule. Check out more full episodes of The ...

Check out these secret messages and more. See more in this Ancient Aliens marathon. New Season Fri., Feb. 7 at 9/8c; Stream Next Day, and stay up to date on all of your favorite shows on The HISTORY Channel website at http://history.com/schedule. #AncientAliens Subscribe for more from ...

A Shepard in Turkey makes a remarkable discovery of a strange stone structure engraved with interesting carvings, see more in this clip from Season 21, Episode 1, "The Top Ten Extraordinary Discoveries." New Season Fri., Feb. 7 at 9/8c; Stream Next Day, and stay up to date on all of your ...

Ancient Aliens is counting down the world's top ten most mysterious sites. See more in this marathon from Ancient Aliens. New Season Fri., Feb. 7 at 9/8c; Stream Next Day, and stay up to date on all of your favorite shows on The HISTORY Channel website at http://history.com/schedule. ...

Researchers do a deep dive analysis on some strange alien theories, see more in this Ancient Aliens marathon. New Season Fri., Feb. 7 at 9/8c; Stream Next Day, and stay up to date on all of your favorite shows on The HISTORY Channel website at http://history.com/schedule. #AncientAliens ...

During a congressional hearing regarding Unidentified Aerial Phenomena, the Pentagon released never before seen footage of UFO activity. See more in this clip from Season 3, Episode 11, "Congressional UFOS, New Nessie and Zombie Fish." Watch all your favorite episodes of The Proof Is Out ...

Check out these strange & unbelievable alien theories, see more in this Ancient Aliens marathon. #AncientAliens Subscribe for more from Ancient Aliens and other great The HISTORY Channel shows: http://histv.co/SubscribeHistoryYT Find out more about the show and watch full episodes on our ...

For thousands of years, there have been places around the world considered dangerous to humans. Might these locations hold the key to an otherworldly connection? See more in this marathon from Ancient Aliens. New Season Fri., Feb. 7 at 9/8c; Stream Next Day, and stay up to date on all of your ...