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

Alcatraz Island Prison

Though this prison is no longer in operation, it used to be one of the most violent prisons on Earth. Located off the coast of San Francisco, this island was notorious for seeing several violent escape attempts. It even housed famous prisoners like Al Capone. The Battle of Alcatraz also took place before and it was deemed as one of the most stunning escape attempts ever. Due to its poor reputation and the overall cost of maintaining the place, it was shut down in 1946.