Ancient Aliens: Secrets of the Serpeant Mound (Season 9) | History

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! There are geoglyphs around the world that Ancient Astronaut Theorists believe could have encoded alien messages in this clip from Season 9, Episode 13, “Beyond Nazca“. #AncientAliens Subscribe for more from Ancient Aliens and other great HISTORY shows: Find out more about the show and watch full episodes on our site: