Riverbend Maximum Security Prison inmates tell their stories.

Inmates of California's Valley State Prison for Women try rehabilitation.

A look at how this once infamous jail has reinvented itself.

Inside the largest maximum security facility in Salt Lake City.

Revealing of how these women deal with relationships and struggles.

Behind the walls of Kentucky's only maximum security prison.

Inside the maximum security facility in Eastern Iowa.

One of the most violent and volatile penitentiaries in the nation.

The Corcoran State Prison, located in an isolated valley, is one of California's largest maximum-security institutions.

Violent offenders and mentally ill inmates in Indiana.

Miami's prison system.

Inside the penitentiary of New Mexico.

The Elayn Hunt Correctional Center is the second largest prison in Louisiana.

Oklahoma inmates tell their own remarkable stories.

Half of Chicago's Stateville Correctional Center's inmates are imprisoned for murder.

LA County Jail is a system that is overcrowded, tough on gangs, and struggling with an increase in racial violence.

Inside the maximum security prison inmates call 'the end of the world.'

A profile of San Quentin State Prison in California; one of the most famous, most notorious penitentiaries in the world.