Documented cases of alien abductions led ancient astronaut theorists to believe that aliens were using human DNA to create hybrid humans, in this clip from Season 4, "The Greys." Watch all new episodes of Ancient Aliens, Fridays at 9/8c, and stay up to date on all of your favorite The HISTORY ...

The ancient Mayan civilization were time-keepers. They tracked essential patterns in their long count calendar, which could predict certain events, in this clip from Season 4, "The Doomsday Prophecies." Watch all new episodes of Ancient Aliens, Fridays at 9/8c, and stay up to date on all of your ...

Ancient Astronaut Theorists believe mysterious geoglyphs discovered in Peru act as a supercomplex to connect different civilizations, in this clip from Season 17, "The Lost City of Peru." #AncientAliens Subscribe for more from Ancient Aliens and other great The HISTORY Channel shows: ...

Ancient Astronaut Theorists believe the Hieroglyphics Stairway located in western Honduras chronicles Maya rulers communication with extraterrestrials, in this clip from Season 4, "The Mayan Conspiracy." Watch all new episodes of Ancient Aliens, returning Friday, August 6 at 9/8c, and stay up to ...

After the discovery of human remains found in Viking longships, Ancient Astronaut Theorists believe Valhalla could be an extraterrestrial space craft carrying the deceased, in this clip from Season 5, "The Viking Gods Watch all new episodes of Ancient Aliens, returning soon, and stay up to date ...

Ancient Astronaut theorists believe that this ancient Mayan city holds unusual secrets relating to wizards and Gods descending from the sky, in this clip from Season 5, "The Von Daniken Legacy." Watch all new episodes of Ancient Aliens, returning soon, and stay up to date on all of your favorite ...

Ancient Astronaut Theorists believe that Moses’ encounter with God was very physical and changed his overall appearance - is there a possibility that extraterrestrials might’ve abducted him? Find out in this clip from Season 5, "Strange Abductions." Watch all new episodes of Ancient Aliens, ...

Ancient astronaut theorists believe that the remarkable folding ship gifted to one of the Viking gods from Loki was an alien spacecraft, in this clip from Season 5, "The Viking Gods." Watch all new episodes of Ancient Aliens, returning soon, and stay up to date on all of your favorite The ...

Watch the new season of Ancient Aliens this summer, Fridays at 9/8c on HISTORY. Subscribe for more from Ancient Aliens and other great HISTORY shows: http://histv.co/SubscribeHistoryYT Find out more about the show and watch full episodes on our site: http://po.st/AncientAliens Check out ...

Experts discuss the elaborate Inca road system in South America and the possibility that it might have existed thousands of years before the Inca themselves in this scene from "Aliens B.C". #AncientAliens Subscribe for more from Ancient Aliens and other great HISTORY shows: ...

Earth's prehistory suggests that humans might not have been the first to inhabit it in this collection of scenes from "Aliens B.C". #AncientAliens Subscribe for more from Ancient Aliens and other great HISTORY shows: http://histv.co/SubscribeHistoryYT Find out more about the show and watch full ...

Watch the new season of Ancient Aliens Fridays at 9/8c on HISTORY. Subscribe for more from Ancient Aliens and other great HISTORY shows: http://histv.co/SubscribeHistoryYT Find out more about the show and watch full episodes on our site: http://po.st/AncientAliens Check out exclusive HISTORY ...