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Oklahoma inmates tell their own remarkable stories.

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

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

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

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Alabama's Holman maximum security prison.

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The violent history of San Quentin State Prison in California.

Inmates at San Quentin State Prison find ways to fight boredom.

Inmates receive visitors during their prison stays.

A dangerous combination of gangs, drugs and boredom encourages inmates to commit violent offenses in prison.

A 20-year-old inmate speaks about how he grew up on the streets and what motivates him to turn his life around.

The prison's annual poetry slam.

Grantt Culliver controls the disruptive inmates of Holman Correctional Facility.

Relationships both inside and outside the prison walls.

Dangerous inmates are segregated from the rest of the prison population.

Correctional officers search prisoners for weapons.

Serving life sentences or death sentences in prison.

Unexcused absences create staff shortages at Alabama's Holman Correctional Facility.

Nine of the most violent criminals from the 'Lockup' series give chilling accounts of their crimes.

Inmates must develop methods to cope with the pressures and fear that come with incarceration.

Inmate violence including riots, shanks and attacks on officers.