Alcatraz is an 8.5-hectare U.S. rock island about 500 meters long and up to 41 meters high in San Francisco Bay, California, about 2 kilometers 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 U.S. at the time.
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