The Eastern State Penitentiary is a former American prison in Philadelphia, Pennsylvania and was operational from 1829 until 1971. Its revolutionary system of incarceration was the first to establish the policy of separate confinement, emphasizing principles of reform rather than punishment. When the building was erected it was the largest and most expensive public structure ever constructed, quickly becoming a model for more than 300 prisons worldwide.
The prison is currently a U.S. National Historic Landmark which is open to the public as a museum.

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