Lockup - Season 1 (2005)

A "jail within a prison" protects some inmates from others.

Hard time - and sometimes love - for women behinds bars.

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Maintaining control through "zero tolerance" in Iowa.

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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.

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Oklahoma inmates tell their own remarkable stories.

Inside the prison housing some of Illinois' most violent criminals.

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

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