Behind Bars: The World's Toughest Prisons

Desperate overcrowding, rats, and disease come standard in Antanimora Prison. Surrounded by the capital Antananarivo, it's bursting at the seams.

A prison so fierce that guards stay outside for fear of their lives. Inside, the prisoners are in control: murderers, violent offenders, drug bosses.

Dallas County Jail in Texas - a supersized facility with beds for 7,100 inmates.

With a crumbling foundation more than fit for demolition, the conditions in Sofia Central prison is inhospitable for anyone, including criminals.

The two toughest divisions of the Miami Dade prison complex couldn't be more different.