Inside the history and inner workings of prisons; covering institutions from the Tower of London to the high-tech ADX through interviews with journalists, former correctional officers and previously incarcerated individuals. <br /><br />On the Hanoi Hilton, an American POW prison of the Vietnam War located in the city of Hanoi, Vietnam; captives include John McCain, the group of airmen who invent a secret communication code, and Jerimiah Denton who sneaks messages home on live TV.
