Here are some of the more notorious penitentiaries that are worth checking out. Alcatraz Federal Penitentiary (United States) From 1934 to 1963, the Alcatraz Federal Penitentiary on Alcatraz ...
But the federal government runs only one "Supermax:" the notorious US Penitentiary Administrative Maximum Facility in Florence, Colorado. More widely known as the ADX or the "Alcatraz of the ...
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