Sezon 4
Bölümler
1 Drake's Secret Voyage 2 The True Story of Mutiny on the Bounty 3 Alamo Scouts 4 The Mysteries of King Tut 5 Salem Witch Trials 10 Kas 2011 
6 The True Story of the Philadelphia Experiment 7 Secret Brotherhood of Freemasons 8 Ancient City: Found and Lost 9 The FBI Celebrity Files 10 The Cavemen 11 Secret Plunder: GI Looters 12 Raise the Hunley 13 Italian-American Internment: A Secret Story 14 Mind Control: America's Secret War 15 Pompeii 16 Roswell: Secrets Unveiled
6 The True Story of the Philadelphia Experiment 7 Secret Brotherhood of Freemasons 8 Ancient City: Found and Lost 9 The FBI Celebrity Files 10 The Cavemen 11 Secret Plunder: GI Looters 12 Raise the Hunley 13 Italian-American Internment: A Secret Story 14 Mind Control: America's Secret War 15 Pompeii 16 Roswell: Secrets Unveiled