Alcatraz Island is located in the San Francisco Bay, 1.5 miles offshore from San Francisco, California, United States. Often referred to as "The Rock", the small island was developed with facilities for a lighthouse, a military fortification, a military prison, and a federal prison from 1933 until 1963. Beginning in November 1969, the island was occupied for more than 19 months by a group of Aboriginal peoples from San Francisco who were part of a wave of Native activism across the nation with public protests through the 1970s. In 1972, Alcatraz became a national recreation area and received designation as a National Historic Landmark in 1986.
source:wikipedia\Image by: Pascal Vuylsteker