Alcatraz or ‘The Rock' was designed to be the ultimate prison. Lock up all the really bad guys in one solid isolated prison, separate them from other prisoners and break them down. Its regime was brutal; this wasn't about rehabilitation it was about punishment. Prisoners were transferred to Alcatraz from other prisons when they could not be controlled. For 29 years Alcatraz reined as the most secure and one of the harshest prisons in the land. Surrounded by water and built onto solid rock, this was a prison designed to keep you behind bars for as long as necessary and if you went mad in the meantime, so be it. Both the infamous Al Capone and ‘Machine Gun' Kelly served time in Alcatraz and both made it out the other side.