On an October day last year, people living in apartment blocks located in a coastal area of south Athens in Greece were evacuated. Near their homes, work on a huge urban development was underway. It was stalled after a frightening discovery. According to the Associated Press, it was a 500-pound bomb dating back to World War II. Matthew Osborne of the FBI joined the show to talk about bombs left over from wars. They can be found all over the world, from Europe to Asia and even the U.S.