Alcatraz Federal Penitentiary
 The Alcatraz Federal Penitentiary or United States Penitentiary Alcatraz Island (often just referred to as Alcatraz) was a maximum high-security Federal prison on Alcatraz Island 1.25 miles (2.01 km) off the coast of San Francisco California USA which operated from 1934 to 1963.The main prison building was built in 1910–12. During that time it was a United States Army military prison; Alcatraz was the site of a citadel from the 1860s.