Al Capone spent some of his last days in a cell here. Name that island prison.

This military jail-turned-high-security-prison stands on an island off of San Francisco. Alcatraz Island, known as "The Rock," was as frightening as it sounds when in use. Solitary confinement and brute force weren't unusual there, and some of its highest security prisoners included none other than Machine Gun Kelly and Al Capone, arguably the most famous mobster of all time. Definitely not the type of company you'd want to be in lockdown with.

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