Alcatraz Island, aka “The Rock,” is a small island located 1.25 miles offshore from San Francisco in San Francisco Bay. It was a federal penitentiary housing some of America’s most notorious criminals from 1934-1963. The Island also served as a harbor defense fort and a military prison from 1969-1971. Once a maximum security prison, only three criminals (Frank Morris, John Anglin, and his brother Clarence Anglin) managed to escape from it; US Marshals Service is still looking for answers about their whereabouts. Alcatraz is one of San Francisco's most prominent landmarks and tourist attractions today.