Uploaded August 2026 | Updated September 2026, 3 weeks ago

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Go deep into some of America's most controversial mysteries as this full episode marathon explores covert military operations, one of the nation's most infamous organizations, and enduring theories surrounding hidden history. See more in this marathon from America's Book of Secrets.

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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.