think you’re rock solid? then you’ve never met the prison described as The Rock – Alcatraz. designed to be unescapable, it sits on an island in San Francisco bay and utilises security features that would make today’s best safe-crackers tremble. look over its list of famous inmates and it reads like a who’s who of the mob. Al Capone and Mickey Cohen are amongst inmates who have experienced a little rest and relaxation time within the thick stone walls. whilst only in operation for 29 years, it saw more than its fair share of violence including the famous Battle of Alcatraz in 1947.