Alcatraz Island, Federal prison in San Francisco Bay.
Alcatraz Island, often referred simply as Alcatraz, is an island located in the San Francisco Bay.
It served as a lighthouse, a military fortification and a military prison before being used as a federal prison from 1934 to 1963.
The island became a national recreation area in 1972 and received landmarking designations in 1976 and 1986.
Today, the island is a prominent tourist attraction, receiving more than 1.5 million visitors annually.
Alcatraz is known for its notorious past inmates such as Al Capone and Robert Stroud, the 'Birdman of Alcatraz'.
Location: San Francisco
Population: 0
Elevation above the sea: 41 m
Website: nps.gov/alca/index.htm
Sources: Wikimedia, OpenStreetMap