11. Petak Island Prison (Russia)
While also being considered one of the more horrifying prisons in the world, and being deemed as the “Alcatraz of Prison,” Petak Island Prison is making this list for its aged exterior and the surrounding qualities with the water and it being located on its own island. Aside from the beauty, however, this prison is known to have been one of the worst prisons to be held in, and anybody who was held here has been deemed as being “destroyed” or even killed on the spot. Regardless of the high security nature of this prison, there’s no doubt that this fits the bill, especially since it sits on an island known as Ognenny Ostrov in Lake Novozero.
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