If ancient aliens visited Earth, what was their legacy, and did they leave behind clues that exist in plain sight such as sophisticated aircraft, complex electrical grids, and intricate construction machinery? See more in Season 1, Episode 1, "The Evidence." Watch all new episodes of Ancient ...

For more than four decades, award-winning journalist Linda Moulton Howe has covered the most mysterious phenomena on Earth. See more in this scene from Season 20, Episode 18, "The Linda Moulton Howe Files." Watch all new episodes of Ancient Aliens, Fridays at 9/8c, and stay up to date on all ...

With infrared satellite technology, many believe we have found pyramids beneath the surface of the earth, launching an age of discovery that could rewrite history. See more in Season 1, Episode 16, "Aliens & Pyramids." Watch all new episodes of Ancient Aliens, Fridays at 9/8c, and stay up to ...

These ancient civilizations were built in a very similar pattern. See more in this scene from Season 1, Episode 7, "Aliens Codes and Messages." Watch your favorite episodes of Ancient Aliens on The HISTORY Channel website at http://history.com/schedule. #AncientAliens Subscribe for more from ...

Could this pyramid have been built to greet extraterrestrial visitors? See more in this #Short 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 ...

Ancient Astronaut theorists propose these sites are remnants of a lost extraterrestrial electrical system--one erected to draw energy from the Earth. See more in this clip from Season 1, Episode 8, Energy Lines And Hot Spots. Watch your favorite episodes of Ancient Aliens on The HISTORY ...

Ancient Astronaut Theorists have found compelling similarities between Mount Shasta and the Great Pyramid that explain the purpose they've served, in this clip from Season 17, "The Mystery of Mount Shasta." Watch all new episodes of Ancient Aliens, Fridays at 9/8c, and stay up to date on all ...

Could the pyramids around the globe be somehow interconnected? See more in this scene from Season 2, Episode 11, "Extraterrestrial Pyramids." Watch all new episodes of Ancient Aliens, Fridays at 9/8c, and stay up to date on all of your favorite shows on The HISTORY Channel website at ...

Could it really be that these otherworldly visitors coexist among us, crossing over from unseen dimensions into our world? Find out in this video 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 ...

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. ...

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 ...

Researchers believe extraterrestrial beings took part in building the great pyramids. See more in this clip from Nostradamus Effect. #NostradamusEffect Subscribe for more from Nostradamus Effect and other great The HISTORY Channel shows: http://histv.co/SubscribeHistoryYT Watch more ...