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 ...

If extraterrestrials are watching over humanity, Ancient Astronaut Theorists suggest the next great global catastrophe could be caused by our heavenly ancestors in this clip from Season 9, "The Great Flood". #AncientAliens Subscribe for more from Ancient Aliens and other great HISTORY shows: ...

Tune in to Alien Invasion Week on History starting Monday 9/30 through Friday 10/4 for new Ancient Aliens, plus the premiere of In Search Of, new UFO Specials and More! Ancient Astronaut Theorists claim that extraterrestrials influenced the outcome of the Civil War and made believers out of ...

Tune in to Alien Invasion Week on History starting Monday 9/30 through Friday 10/4 for new Ancient Aliens, plus the premiere of In Search Of, new UFO Specials and More! Investigating how a crystal skull may hold more information than a supercomputer in this digital exclusive from Ancient Aliens. ...

Tune in to Alien Invasion Week on History starting Monday 9/30 through Friday 10/4 for new Ancient Aliens, plus the premiere of In Search Of, new UFO Specials and More! A look at how the Giza pyramids might have once functioned as a power plant in this digital exclusive from Ancient Aliens. ...

Tune in to Alien Invasion Week on History starting Monday 9/30 through Friday 10/4 for new Ancient Aliens, plus the premiere of In Search Of, new UFO Specials and More! Investigate the uniquely precise construction of the megalithic site of Puma Punku in this digital exclusive from Ancient ...

Tune in to Alien Invasion Week on History starting Monday 9/30 through Friday 10/4 for new Ancient Aliens, plus the premiere of In Search Of, new UFO Specials and More! Investigate the possibility that the Incan Emporer Pachacutec and his greatest secrets are buried in a hidden chamber in Machu ...