Behind Bars: The World's Toughest Prisons

Tent City Jail, a prison in the desert of Arizona, is a place where old army tents from the Korean War take the place of traditional prison cells.

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

This is the prison city of San Pedro in La Paz, Bolivia, where the inmates rule and anarchy prevails. Money, violence and power. Only the strongest survive this lawless place, and they rule over the weak, demand protection money.

A look inside Dallas County Jail, which is home to more than 6,000 inmates and has a larger population than many Texas cities and towns.

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.