Meteor impacts, cosmic microbes, and space viruses have significantly impacted life as we know it. See more in this scene from Season 2, Episode 3, "Interstellar Fallout". Watch your favorite episodes of Ancient Aliens on The HISTORY Channel website at http://history.com/schedule. ...

Did aliens construct this ancient wonder of the world? 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. 00:00 — Aliens Construct the 8th Wonder of the World 05:57 — Mysterious ...

Does an alien really work with the government at Area 51? See more in Season 2, Episode 4, "Extraterrestrial Close Encounters." Watch your favorite episodes of Ancient Aliens on The HISTORY Channel website at http://history.com/schedule. #AncientAliens Subscribe for more from Ancient Aliens ...

Check out these top 3 moments where Ireland experienced extra terrestrial phenomena. 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 ...

Did giants from the sky build these structures on Earth? See more in this scene from Season 2, Episode 5, "Aliens and the Buried Past." Watch your favorite episodes of Ancient Aliens on The HISTORY Channel website at http://history.com/schedule. #AncientAliens Subscribe for more from Ancient ...

An investigation is opened when a pilot claims to have seen a gigantic spaceship while on a flight. See more in this scene from Season 2, Episode 1, "Unidentified Aerial Phenomena." Watch your favorite episodes of Ancient Aliens on The HISTORY Channel website at http://history.com/schedule. ...

Witness the top 5 most compelling UFO sightings connected to the enigmatic Skinwalker Ranch in this exclusive recap. New episodes of The Secret of Skinwalker Ranch coming soon. Stay up to date on all your favorite The HISTORY Channel shows at http://history.com/schedule. Check out more full ...

Area 51 has extreme security measures in place. So what lies inside this secretive military base? See more in this scene from Season 2, Episode 2, "Extraterrestrial Informants." Watch your favorite episodes of Ancient Aliens on The HISTORY Channel website at http://history.com/schedule. ...

Do these pieces of evidence point to otherworldly connections to mankind? 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 ...

The largely unexplored continent of Antarctica has long been subject to rumors of UFOs, underground tunnel networks, and concealed ancient structures, giving rise to speculation about an alien presence beneath its icy surface. Learn more in this clip from Season 2, Episode 6, MYSTERIES BENEATH ...

Did alien knowledge assist humans in making achievements in outer space? See more in this scene from Season 1, Episode 11, "Mission to Outer Space." Watch your favorite episodes of Ancient Aliens on The HISTORY Channel website at http://history.com/schedule. #AncientAliens Subscribe for more ...

Does this evidence confirm the existence of a lost civilization? 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 ...