Alcatraz is an 8.5-hectare (1.5 acres) U.S. rocky island about 500 metres (1,500 ft) long and up to 41 metres (41 ft) high in San Francisco Bay, California, about 2 km (1 mi) off the mainland.
In the second half of the 19th century, it was used as the site of a fortified fort. In the early 1930s, the fort was converted into a prison island and functioned from 1934 to 1963 as one of the most famous and notorious maximum-security prisons in the United States at the time.
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