Scientists believe that aliens have existed since the creation of life on Earth. In some ways, this implies that the alien civilization is more advanced than man, and many monuments worldwide are proof of this. Apart from displaying their technological advancement, some of these structures tell ...

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 ...

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 why the Mayans used several calendars with no apparent solar connection - and how one of their calendars points to ...