CNN Anderson Cooper 360 March 21, 2013 00:41:00
Isabella stewart gardner museum in boston. this is where it all began, the night of march 18th, 1990. it was st. patrick's day weekend. there was a house party at the building right behind the museum. sometime after midnight, a group of young men left the party and spotted a car with what looked like two boston police officers inside. they had no idea these two men weren't really police officers. and no clue that just a short time later these two men would pull off the greatest art heist in history. >> come in, clock in, there would be two guards. >> reporter: rick abagent was one of the night...