Eastern State Penitentiary
Located in Philadelphia, Pennsylvania, Eastern State Penitentiary is an iconic 19th-century fortress-style prison that revolutionized modern penal systems worldwide. Opened in 1829, it pioneered strict solitary confinement known as the 'Pennsylvania System.' Famous for housing infamous criminals like Al Capone and Willie Sutton, the abandoned, crumbling cellblocks are globally recognized as one of America's most intensely haunted historic locations.