Behind Bars The World's Toughest Prisons

A prison in the desert of Arizona, USA, is a tough place, where tents instead of cells make up prison housing.

A look inside the notorious Madagascan prison, where inmates endure overpopulation, malnutrition, and a potentially deadly rodent infestation.

In the prison city of San Pedro in La Paz, Bolivia, the inmates rule and anarchy prevails. Only the strongest survive this lawless place and they rule over the weak.

Exploring the Dallas County Jail in Texas, which has a population larger than many cities and towns, varying from small-time criminals to serial killers.

The Central Prison of Sofia is a European prison that is practically in ruins. Violence, abuse and isolation make prisoners' lives a nightmare.

The Miami-Dade County Jail and the Miami Dade Boot Camp are the two toughest divisions of the Miami Dade prison complex, but they couldn't be more different.