Anyone who has paid a visit to the San Francisco area can tell you all about their memories of the Alcatraz prison. Visible from the Golden Gate Bridge, it is an imposing sight that sears itself into our memories. It was the most dangerous prison in the nation until 1963 and is well known for housing some of the most notorious criminals the United States has ever known.

Since the prison was located on an island, it made escape quite impossible. However, three dozen prisoners attempted to do so. All of them were thought to have failed, though. Three brothers are believed to have come the closest. Clarence Anglin, John Anglin and Frank Morris spent several months working to widen their cells’ ventilation ducts and used a variety of tools to accomplish the task.

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