The world's most iconic places, groundbreaking inventions and influential people are explored. Facts that have been obscured by history are revealed as viewers go behind the scenes where the average tourist never gets to go. 　　S3 E1 - Pearl Harbor 　　S3 E2 - Civil War 　　S3 E3 - The Vatican 　　S3 E4 - Gold 　　S3 E5 - Secret Prisons 　　S3 E6 - Code Wars 　　https://www.discoveryuk.com/series/codes-a...