San Quentin State Prison

San Quentin State Prison is a California State Prison located near the city of San Rafael, California, though the prison has its own zip code. Opened in July 1852, San Quentin is the oldest prison in the state, and the location of California's only gas chamber and death row for male inmates, although recent executions have been carried out by lethal injection. The correctional complex sits on Point San Quentin, which comprises 432 acres (1.7 km²) of waterfront along the north side of San Francisco Bay. Its position on otherwise desirable real estate in the San Francisco Bay Area has resulted in the net worth of the prison to be estimated at nearly $100 million, making it the most valuable prison in the world.