• Visitor during the evening tour of Alcatraz gaze into the many cells that line up the corridor known as

    Alcatraz Island

    California

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Garden Conservancy


Did You Know?

Military prison under construction on Alcatraz.

In 1909 the U.S. Army began construction on the largest reinforced concrete structure in the world - a new military prison necessary because of a large influx of U.S. soldiers convicted of crimes in the Philippines. This building would become the famous U.S. Penitentiary Alcatraz in 1934.