The Eastern State Penitentiary is a former American prison in Philadelphia, Pennsylvania. It is located in the Fairmount section of the city, and was operational from 1829 until 1971. The penitentiary refined the revolutionary system of separate incarceration first pioneered at the Walnut Street Jail which emphasized principles of reform rather than punishment. Notorious criminals such as Al Capone and bank robber Willie Sutton were held inside its innovative wagon wheel design.