Watch Series: History's Secrets Released in (2001) - Season 1 produced by USA, The TV Series categorized in Documentary, and content rating TV-PG with duration 45 min broadcasted as these networks National Geographic, Streamed at Putlocker Mysterious events, compelling figures and great unanswered questions from the past are explored, with a focus on the reclusive billionaire Howard Hughes; the CIA's top-secret experiments; the Unabomber and; little known stories from NASA's Apollo missions. - Season 1