Ancient Aliens: Season 18, Episode 11 - ProjectFreeTV

18 - 11: Ancient Aliens On Location: Incredible Structures

Ancient Aliens has traveled to many mysterious sites that seem to defy explanation. Now, Giorgio Tsoukalos takes a look back at some of the most incredible structures we've visited all over the world. Structures that, as far as Giorgio is concerned, provide undeniable evidence of extraterrestrial contact.