TV series
Mysterious events, compelling figures, and great unanswered questions from the past are explored in this National Geographic series.
Availability
Checked Jul 22, 2026
We don't have a confirmed streaming, rental or purchase option for History's Secrets yet.
Mysterious events, compelling figures, and great unanswered questions from the past are explored in this National Geographic series.
Choose an episode, then use the watch options above for the show.
Episode 1
How could a man, so rich, famous and visible for so long, become an isolated recluse? Recent medical studies shed new light on the life and death of one of America's most intriguing billionaires.
Where to watch History's SecretsEpisode 2
More than 20 years after army scientist Dr Frank Olson falls to his death from a hotel window in 1953, the US government reveals he was involved in secret experiments studying LSD and interrogation.
Where to watch History's SecretsEpisode 3
Maths whiz and child prodigy, Ted Kaczynski found academic glory at Harvard by the age of 16 but strange and dangerous stress tests he took here may have influenced his later rampage which killed 3.
Where to watch History's Secrets
Episode 4
24 astronauts ventured to the moon on a single engine with the Apollo missions. These are the untold stories of NASA's rarely-remembered breakthroughs, harrowing escapes and heartbreaking disasters.
Where to watch History's SecretsEpisode information updated Jul 23, 2026
Available now in United States
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National GeographicUnited States