San Francisco Bay is the artificial and flat Treasure Island, site of the 1939 Golden Gate International Exposition. From the Second World War until the 1990s, both islands served as military bases and are now being redeveloped. Isolated in the center of the Bay is Alcatraz, the site of the famous federal penitentiary. The federal prison on Alcatraz Island no longer functions, but the complex is a popular tourist site. Despite its name, Mare Island in the northern part of the bay is a peninsula rather than an island. San Francisco Bay is thought to represent a down-warping of the Earth's crust between
Alcatraz Island in popular culture Alcatraz Island in popular culture Alcatraz Island has appeared many times in popular culture. Its appeal as a picturesque film setting derives from its natural beauty, isolation and its history as a prison (now a museum) from which, officially, no prisoner ever successfully escaped. Most appearances of Alcatraz island in popular culture are related to its former status as a federal prison. Both real life and fictional accounts of imprisonment on the island have been popular. One of the best-known of Alcatraz's historic inmates was Robert Franklin Stroud, known as "The Birdman of Alcatraz". His biography was written by Thomas