There are some prisons so dark, so terrifying, they look like they’ve come straight out of a horror movie. One of the most infamous of these is situated in San Francisco Bay, a mile off the coastline on its own little island, designed to securely incarcerate the most dangerous men convicted in the USA and ensure they had no chance of ever escaping. The name of the prison was Alcatraz. During its use as a federal prison, some of Alcatraz’s most famous residents included Alvin ‘Creepy’ Karpis, the