Some of these petroglyphs make experts wonder if they were created because of extraterrestrials. See more in this scene from Season 1, Episode 12, "The Global Connection."
Watch all new episodes of Ancient Aliens, Fridays at 9/8c, and stay up to date on all of your favorite shows on The HISTORY Channel website at http://history.com/schedule.
"Ancient Aliens" explores the controversial theory that extraterrestrials have visited Earth for millions of years.
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