A National Park Service ranger walks down "Broadway" in the main cell block on Alcatraz Island, 14 June 2007 in San Francisco Bay of California. Sometimes referred to as "The Rock", the island of ... more 
A National Park Service ranger walks down "Broadway" in the main cell block on Alcatraz Island, 14 June 2007 in San Francisco Bay of California. Sometimes referred to as "The Rock", the island of Alcatraz served first as a military fortification, before it became a federal penitentiary in 1934. Now Alcatraz is national recreation area under the supervision of the Naitonal Park Service (NPS) with more than a million visitors a year taking the short ferry ride from San Francisco's Fisherman's Wharf to experience the infamous maximum-security prison for high-risk convicts. Famous island residents have included "Machine Gun" Kelly, Al Capone and Robert "Birdman" Stroud. AFP PHOTO / Robyn BECK (Photo credit should read ROBYN BECK/AFP/Getty Images) less 
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Yahoo News | Photo By Staff / AFP/Getty Images
Fri, Mar 22, 2013 2:00 PM EDT