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  2. Designated NHLD. January 17, 1986 [3] Alcatraz Island ( / ˈælkəˌtræz /) is a small island 1.25 miles (2.01 km) offshore from San Francisco, California, United States. [1] 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 ...

  3. 2 days ago · Alcatraz Island, also known as ‘The Rock,’ a rocky island in San Francisco Bay, off the coast of California, in the United States. From 1934 to 1963, a facility on the island served as a federal prison for some of the most dangerous civilian prisoners. Learn more about the history of Alcatraz Island here.

    • The Editors of Encyclopaedia Britannica
  4. Nov 30, 2022 · Completed in 1912 with 600 single cells, each with toilet and electricity, the Cellhouse was the largest reinforced concrete building in the world. In 1915 Alcatraz was changed from a military prison to "Pacific Branch, U.S. Disciplinary Barracks." The new name reflected the growing emphasis on rehabilitation as well as punishment.

  5. Alcatraz, former maximum-security prison located on Alcatraz Island in San Francisco Bay, off the coast of California. Alcatraz, originally envisioned as a naval defense fortification, was designated a residence for military offenders in 1861, and it housed a diverse collection of prisoners in its.

    • The Editors of Encyclopaedia Britannica
  6. United States. Building Category. Prison. Alcatraz Island was the site of a notoriously harsh prison based off the coast of San Francisco, California, this isolated position earning it the...

    • Sarah Roller
  7. 1912: The new Cellhouse (Alcatraz's fourth prison), built with convict labor, is completed and prisoners move in. At the time the Alcatraz Cellhouse was the largest concrete structure in the world. 1915: Alcatraz is renamed the "United States, Disciplinary Barracks."

  8. Aug 30, 2023 · Alcatraz has a many-layered history: Civil War fortress, military prison, federal prison, bird sanctuary, first lighthouse on the West Coast, and the birthplace of the American Indian Red Power movement: These are just a few of the fascinating stories of the Rock. Alcatraz Island is a designated National Historic Landmark for its significant ...

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