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 Hospital assigned to the Federal Prison Service. While a physician was in residence on the island through the 1950s, cost cutting measures included switching to private contracted physicians. Two of the most notable hospital patients were Robert Stroud, the "Birdman of Alcatraz", who had his own hospital cell; and Al Capone who spent more time in the hospital than in the general prison population. Alcatraz Hospital Alcatraz Hospital is a defunct hospital which was located on Alcatraz Island, California, US. It began operations in the 19th century while the United States Army operated Fort Alcatraz and continued to provide services after