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.
![History's Secrets](https://image.tmdb.org/t/p/w342/7pUKdVln6jfNDoGIcqJ0auv0feh.jpg)