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Tourists behind bars

Tourists do an audio tour of the main cell block at Alcatraz Island on March 21, 2013 in San Francisco, California. (Justin Sullivan/Getty Images)

Tourists behind bars

Former prisons like Alcatraz and Missouri State Penitentiary have become increasingly popular

tourist destinations in America and abroad.

Playing to the public

curiosity about life behind bars, more than 100 former prisons and jails

have tours or museums. (Reuters)