History's Secrets

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.

• Last Air Date: 2011-01-25
• Total Seasons: 4
• Total Episodes: 27
• Episode Runtime: 45 min.