Did aliens really help to shape our history? See more in this two hour marathon from Ancient Aliens. 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 http://history.com/schedule. #AncientAliens ...

If ancient aliens visited Earth, who were they, and where did they come from? Possible historic evidence and beliefs are examined around the world. See more in Season 1, Episode 2, "The Visitors." Watch all new episodes of Ancient Aliens, Fridays at 9/8c, and stay up to date on all of your ...

Are these great Pharaohs and Gods from an extraterrestrial background? See more in this compilation from Ancient Aliens. 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 http://history.com/schedule. ...

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 ...

From biblical patriarchs to modern day alien abductees, throughout history, there have been people who claimed to have contact with otherworldly beings. And often bearing important messages for humanity. Could it be that they have been chosen to help carry out an extraterrestrial agenda? See ...

There is evidence that suggests we experienced 20th century alien contact. In 1942, the Battle of Los Angeles involved the US military and Air Defense allegedly fighting a UFO. See more in Season 1, Episode 5, "The Return." Watch all new episodes of Ancient Aliens, Fridays at 9/8c, and stay up ...

Has NASA found definitive signs of life on Mars that they're intentionally keeping from the public? See more in this compilation from Ancient Aliens. 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 ...

Did an Italian reconnaissance pilot capture genuine UFO photos in 1979? See more in this scene from Season 4, Episode 15, "Classic UFO, Headless Zombie Fish, and Crying Virgin Mary." Watch all new episodes of The Proof Is Out There, Fridays at 10/9c, and stay up to date on all of your favorite ...

Ancient underwater cities can be found around the globe, but could these aquatic worlds be the ruins of unknown civilizations--or even proof of extraterrestrial visitations? See more in Season 2, Episode 4, "Aliens Above and Below." Stay up to date on all of your favorite The HISTORY Channel ...

You won't believe some of these shocking eyewitness encounters, in this compilation from The Proof Is Out There. Watch all new episodes of The Proof Is Out There, Fridays at 10/9c, and stay up to date on all of your favorite The HISTORY Channel shows at http://history.com/schedule. If you ...

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 ...

Ancient astronaut theorists uncover Mesopotamian inscriptions that provide evidence of the Anunnaki existence thousands of years ago. See more in this clip from "Aliens and Lost Civilizations." Stay up to date on all of your favorite The HISTORY Channel shows at http://history.com/schedule. ...