Season
- Season 4 2009-01-01
- Season 3 2008-01-01
- Season 2 2007-01-01
- Season 1
History's Secrets Season 3 Hunting the Anthrax Killer
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.
