Ancient Aliens: STRANGE STRUCTURE DISCOVERED ON MARS (Part 1) (Season 16) | History

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A strange keyhole-shaped formation protruding from Mars may directly correlate to a similar structure on Earth - Theorists believe extraterrestrials built these to signal humans, in Season 16, "The Galactic Keyhole." #AncientAliens
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"Ancient Aliens" explores the controversial theory that extraterrestrials have visited Earth for millions of years.

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