Alcatraz Island (sometimes informally referred to as simply Alcatraz or by its pop-culture name, The Rock) is a small island located in the middle of San Francisco Bay in California, United States. It served as a lighthouse, then a military fortification, then a military prison followed by a federal prison until 1963, when it became a national recreation area.

Alcatraz Island (sometimes informally referred to as simply Alcatraz or by its pop-culture name, The Rock) is a small island located in the middle of San Francisco Bay in California, United States. It served as a lighthouse, then a military fortification, then a military prison followed by a federal prison until 1963, when it became a national recreation area.