Alcatraz Federal Penitentiary

Built 1934.

Built: 1934

United States Penitentiary, Alcatraz Island, also known simply as Alcatraz or The Rock, was a maximum security federal prison on Alcatraz Island, 1.25 miles (2.01 km) off the coast of San Francisco, California, United States. The site of a fort since the 1850s, the main prison building was built from 1910 to 1912 as a U.S. Army military prison.

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