Formerly known as one of the toughest prisons in America, this massive complex was once home to medical experiments and a chaotic hostage situation; it's better remembered as the setting for the iconic opening scene of "The Blues Brothers." Stories: 1) Illinois State Penitentiary, Joliet, Illinois; 2) Ark Nuclear Bunker, Konjic, Bosnia and Herzegovina; 3) Keelung, Taiwan; 4) Vilarinho Da Furna, Campo do Gerês, Portugal