In general, prison is a pretty dreadful place to find oneself. It is not really meant to be a cake-walk, but, just in the interest of common decency, one would hope for some sort of standards. Unfortunately, despite there being all kinds of laws and human rights stuff, some prisons simply do not give a fig about such things.

From getting eaten alive by rats, to being held in coffins, here are 20 Worst Prisons in History.

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