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 order to break in and stop them. In "The Power of Two", season1, episode 20 of the American television series "Charmed", the evil spirit of a serial killer escapes from Alcatraz Island seeking revenge on his judge and jury. Phoebe and Prue must figure out how to vanquish this evil spirit and prevent his killing again without their sister Piper, who's vacationing in Hawaii. The 2012 television series "Alcatraz" involves prisoners from Alcatraz - which was not closed due to budget reasons, but because all 302 residents mysteriously disappeared on March 20, 1963 - reappearing in the present day, requiring