One of the most compelling arguments for the Ancient Astronaut theory is the remarkable engineering evident in the construction of ancient megalithic sites worldwide. See more in this scene from Season 1, Episode 1, "Extraordinary Engineering." Watch all new episodes of Ancient Aliens, Fridays ...

Is it possible that ancient rulers were, in fact, connected with divine or, some would say, extraterrestrial forces? And, if so, what was their purpose? On every continent there are stories of incredible treasures that have been lost for centuries. See more in Season 2, Episode 10, "Ancient ...

Ancient Astronaut Theorists question who built Nan Madol after an artificial irrigation system is discovered, in this clip from Season 15, "The Mystery of Nan Madol." 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 ...

Watch as these big alien secrets are reveal, see more in this Ancient Aliens compilation. 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 Subscribe for ...

Ancient Astronaut Theorists visit the most sacred temple in Egypt, The Temple of Edfu, in this clip from Season 18, "Ancient Aliens On Location: Decoding The Alien Glyphs." Watch all new episodes of Ancient Aliens, Fridays at 9/8c, and stay up to date on all of your favorite shows on The ...

The Ark of the Covenant is one of the most sought after religious relics of all times and far more than just a box that contained the Ten Commandments. See more in Season 6, Episode 10, "Aliens and the Lost Ark." Watch all new episodes of Ancient Aliens, Fridays at 9/8c, and stay up to date on ...

Watch as these mysterious alien mysteries are intervened by the Bible, see more in this Ancient Aliens compilation. 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. ...

Explore the ancient ruins of Teotihuacán in this Ancient Aliens compilation. 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 Subscribe for more from ...

Across ancient civilizations, the world's mountains were viewed as the sacred home to all-powerful gods. See more in Season 6, Episode 11, "Aliens and Mysterious Mountains." Watch all new episodes of Ancient Aliens, Fridays at 9/8c, and stay up to date on all of your favorite shows on The ...

In this video, we're going to share with you some of the most incredible UFO sightings ever captured on camera. From strange lights in the sky to unidentified flying objects, this video is filled with proof of aliens! If you're curious about UFOs and want to see proof of aliens, then this ...

These ancient structures hold not only history but deep secrets that will soon be revealed. See more in this Ancient Aliens compilation. 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 ...

One of the most compelling arguments for the Ancient Astronaut theory is the remarkable engineering evident in the construction of ancient megalithic sites worldwide. See more in this scene from Season 1, Episode 1, "Extraordinary Engineering." Watch all new episodes of Ancient Aliens, Fridays ...