I've never been in there but I've heard wild shit about ADX Florence. Apparently they have a ward for for inmates from the rest of the country that normal solitary confinement won't fix (notorious rapists, always starting mess hall fights etc.)
They call it the "behavioral modification facility" and it's they put you in pitch black solitary, strapped to the bed and drugged with some mind numbing chemical.
Tongo Tongo is a village in the rural commune of Tondikiwindi, Ouallam Department, Tillabéri Region in southwestern Niger, 174 km north of the nation's capital Niamey and 28 km south of the border with Mali