These 10 Most Dangerous Prisons will Scare the Hell Out of You

Carandiru Penitentiary

This penitentiary in Brazil is one of the most violent and deadliest prisons in the world. In 1992, an extremely violent massacre took place and it killed 102 inmates. Aside from violence that occurs all the time, health and sanitation is also really bad. In fact, 1 in 5 inmates were diagnosed to be HIV-infected.