Eastern State Penitentiary, also known as ESP, is a former American prison in Philadelphia, Pennsylvania located at 2027 Fairmount Avenue, in the Fairmount section of the city.
The penitentiary, which operated from 1829 until 1971, refined the revolutionary system of separate incarceration first pioneered at the Walnut Street Jail which emphasized principles of reform rather than punishment.
Criminals such as the bank robber Willie Sutton and gangster Al Capone were held in its innovative wagon wheel design. Once fully completed, the building was the largest and most expensive public structure ever erected, and quickly became a model for more than 300 prisons worldwide.
Find out more – http://www.easternstate.org