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!

Ancient Astronaut Theorists believe they have the answer the mysterious disappearance of the Mayan civilization in this clip from Season 9, "The Vanishings". #AncientAliens
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"Ancient Aliens" explores the controversial theory that extraterrestrials have visited Earth for millions of years.

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