Historic
Alcatraz Island
Alcatraz Island () is a small island about 1.25 miles offshore from San Francisco in San Francisco Bay, California, near the Golden Gate strait. The island was developed in the mid-19th century with facilities for a lighthouse, a military fortification, and a military prison. In 1934, the island was converted into a federal prison, Alcatraz Federal Penitentiary.
Why it's on the map
It was designated as a National Historic Landmark in 1986.
Part of the Golden Gate National Recreation Area since 1972, the entire Alcatraz Island was listed on the National Register of Historic Places in 1976.
Source: Wikipedia / Wikidata
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