Are these structures ACTUALLY from out of this world? See more in this compilation from Ancient Aliens. 00:00 - Carnac Stones Baffle Archaeologists 03:45 - Sky God Landing Pad in Baalbek 06:46 - Extraterrestrial Ties to Japan’s Holiest Monument 12:31 - Giant Stone Structure Hides a Secret ...

He didn't tell anyone what he saw for YEARS. 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. #AncientAliens Subscribe for more from ...

This mysterious area may be best known for its meteorite activity. See more in this scene from Season 19, Episode 6, "Cosmic Impacts." 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 ...

This mysterious interstellar object has been boggling scientist's minds. See more in this scene from Season 19, Episode 6, "Cosmic Impacts." 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 ...

He is one of the most prolific inventors of the 20th century--and the man that actually electrified the world. See more in Season 8, Episode 6, "The Tesla Experiment." Watch your favorite episodes of Ancient Aliens on The HISTORY Channel website at http://history.com/schedule. #AncientAliens ...

These giant creatures could have been walking among us. See more in this Ancient Aliens compilation. 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 great The ...

The vast Alaskan wilderness is well known for mysterious disappearances, electromagnetic anomalies, stories of strange creatures, and is a hotspot for UFO sightings. Could Alaska's many mysteries be due to a presence that is not of this world? Find out in this clip from Season 19, Episode 8, ...

Was this CIA member killed because he wasn't supposed to see something at the base of Mt. Hayes in Alaska? See more in this scene from Season 19, Episode 8, "The Mysteries of Alaska." Watch your favorite episodes of Ancient Aliens on The HISTORY Channel website at http://history.com/schedule. ...

How could these massive ancient structures have been made without the help of giants?! See more in Season 19, Episode 10, "The Giants of Malta." Watch all new episodes of Ancient Aliens, Fridays, at 9/8c, and next day on The HISTORY Channel website at http://history.com/schedule. ...

Have you ever wondered what secrets lie inside the ancient pyramids? Check out this compilation from Ancient Aliens! 00:38 Western Java, Indonesia 03:59 Magelang, Indonesia 06:37 Giza, Egypt Watch your favorite episodes of Ancient Aliens on The HISTORY Channel website at ...

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 ...

Many people believe that there are extraterrestrial reptilian humanoids that have been spotted on Earth. See more in this compilation from Ancient Aliens. 00:00 Reptilian-Human Hybrid 03:49 Reptilian Statues 10:23 Patient with Reptilian Heart Watch your favorite episodes of Ancient Aliens on ...