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This marathon dives into ancient cities, alien relics, and top-secret government cover-ups—tracking the countdown to disclosure and evidence that may link advanced beings to our earliest civilizations. See more in this Ancient Aliens marathon.

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

HISTORY® is the leading destination for award-winning original series and specials that connect viewers with history in an informative, immersive, and entertaining manner across all platforms. The network’s all-original programming slate features a roster of hit series, premium documentaries, and scripted event programming.