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!
Over 300 giant stone spheres have been found in the jungles of Costa Rica. According to legend, these were cannonballs from the god of thunder, but Ancient Astronaut Theorists suggest they could actually be the creation of extraterrestrials in this clip from Season 9, “The Monoliths”. #AncientAliens
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“Ancient Aliens” explores the controversial theory that extraterrestrials have visited Earth for millions of years.
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