Ancient Aliens: Mysterious South American Civilization Linked to ETs (Season 17) | History

Ancient Astronaut Theorists believe that Caral-Supe was once a thriving civilization that might’ve received help from extraterrestrials, in this clip from Season 17, "The Lost City of Peru."

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"Ancient Aliens" explores the controversial theory that extraterrestrials have visited Earth for millions of years.

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