Ancient Aliens: The Aliens Who Helped Ancient Cultures Survive (Season 9) | History

Archaeologists have found the remains of ancient civilizations at sites around the world that may explain how some cultures survived cataclysmic events in this clip from Season 9, Episode 3, "Aliens Among Us". #AncientAliens
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"Ancient Aliens" explores the controversial theory that extraterrestrials have visited Earth for millions of years.

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