Alcatraz, former maximum-security prison located on Alcatraz Island in San Francisco Bay, off the coast of California. Alcatraz, originally envisioned as a naval defense fortification, was designated a residence for military offenders in 1861, and it housed a diverse collection of prisoners in its

Alcatraz was the site of the first lighthouse in the Western United States but became a federal penitentiary from 1934 to 1963, housing famous convicts such as Al Capone and George "Machine Gun" Kelly. Now, this once infamous prison island is part of the Bay Area’s 80,000-acre Golden Gate National Recreation Area.