1. Inside Riverbend

Riverbend Maximum Security Prison inmates tell their stories.

2. Return to Valley State

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

3. Return to Rikers Island

See how the once-infamous Rikers Island jail has reinvented itself.

4. Inside Utah State Prison

Inside the largest maximum security facility in Salt Lake City. A "jail within a prison" protects some inmates from others.

5. Inside North Carolina Women's Prison

Revealing of how these women deal with relationships and struggles.

6. Inside Kentucky State Penitentiary

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

7. Inside Anamosa

Inside the maximum security facility in Eastern Iowa.

8. Return to Pelican Bay

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

9. Return to Corcoran

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

10. Inside Wabash

California's Kern Valley State Prison opens its doors in 2005.

11. Inside Miami-Dade Corrections

Miami's prison system.

12. Inside The Penitentiary of New Mexico

13. Inside Elayn Hunt Prison

14. The Inmate Diaries

Oklahoma inmates tell their own remarkable stories.

15. Inside Stateville

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

16. Inside LA County Jail

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

17. Inside Folsom Prison

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

18. Inside San Quentin

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