Could the darkest recesses of our planet contain important information left by our ancient ancestors? And within Earth’s mysterious caves, might we find evidence of otherworldly contact? Throughout human history, some caves have been considered sacred places for spiritual encounter and enlightenment, while others have been feared as true portals to purgatory. See more in Season 9, Episode 1, “Forbidden Caves.”
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“Ancient Aliens” explores the controversial theory that extraterrestrials have visited Earth for millions of years.
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