Marty Lagina, of HISTORY’s #1 series “The Curse of Oak Island,” has been approached by numerous people offering leads into some of the world’s greatest mysteries and has learned of an enigma that rivals Oak Island – a story of national treasure that goes back to the Civil War – in the new six-episode non-fiction series “The Curse of Civil War Gold,” premiering Tuesday, March 6 at 10PM ET/PT.