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! Bolivia's stone blocks are so precise that Ancient Astronaut Theorists believe they could not have been built without advanced ...

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! Giorgio talks with an engineer who built a prototype to back up his theory that Puma Punku's stone blocks were actually part of ...