History decoded: the 10 greatest conspiracies of all time

John Wilkes Booth : was Lincoln's assassin apprehended?

Confederate gold : stolen treasure or hidden wealth of a new Confederacy?

The Georgia Guidestones : America's Stonehenge

DB Cooper : American outlaw

The White House : where is the cornerstone of democracy?

The Spear of Destiny : history's most sacred relic

The real Da Vinci code : did Leonardo predict an apocalypse?

Is there any gold in Fort Knox?

UFOs : inside Roswell and Area 51

The Kennedy assassination : the truth is out there.