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
Warden's House (Alcatraz Island) Warden's House (Alcatraz Island) The Hoe House was the home of the wardens of the federal penitentiary on Alcatraz Island, off San Francisco. It is located at the northeastern end of the Main Cellblock, next to Alcatraz Lighthouse. The 3-floor 15-room mansion was built in 1921 according to the Golden Gate National Recreational Area signpost, although some sources say it was built in 1926 or 1929 and had 17 or 18 rooms. Between 1934 and 1963 the four wardens of Alcatraz resided here including the first warden, James A. Johnston. A house of luxury in stark contrast to the jail