Countries all over the world are experiencing strange UFO sightings on major mountains. See more in this clip from Season 21, Episode 6, "The Top Ten Mysterious Mountains." Watch all new episodes Fridays 9/8c; Stream Next Day, and stay up to date on all of your favorite shows on The HISTORY ...

Witnesses are shocked to see a UFO hovering over the blazing California wildfires, see more in this clip from Season 1, Episode 6, "Weeping Mary and the Montana Alien." Watch full episodes of The Proof Is Out There, and stay up to date on all of your favorite The HISTORY Channel shows at ...

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 ...

The Greek God Constantine changes the world forever when he discovers a cross shaped object hovering above him, see more in this clip from Season 1, Episode 6, "Alien Arsenal." 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 ...

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 ...

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 ...

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 ...

In the 21st century, the search for extraterrestrial intelligence is ramping up like never before, with powerful new technologies allowing us to explore billions of stars across the universe. See more in this scene from Season 20, Episode 14, "The Search For Extraterrestrial Intelligence." ...

For thousands of years, cultures around the world have held a belief in stargates through which beings have traveled to Earth from distant points in the universe and even other dimensions. See more in this scene from Season 20, Episode 12, "Unlocking the Stargates." Watch all new episodes of ...

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 ...

Did you know that there's a network of private citizens that investigate UFOs? See more in this scene from Season 19, Episode 5, "The MUFON Files." Watch all new episodes of Ancient Aliens, Fridays, at 9/8c, and next day on The HISTORY Channel website at http://history.com/schedule. ...

In 1849, ancient Babylonian Star Catalogs were discovered in Iraq, providing proof of celestial knowledge given by extraterrestrials, in this clip from Season 5, "Destination Orion." #AncientAliens Subscribe for more from Ancient Aliens and other great shows from The UnXplained Zone: ...