Sean Kelley, senior vice president at the Eastern State Penitentiary, displays a plate of "food loaf," a punishment food currently served in Pennsylvania prisons. Over the weekend, the historic penitentiary, now a museum, served visitors sample meals from the 1800s, 1900s and today. Matt Rourke/AP hide caption

itoggle caption Matt Rourke/AP

Stephen Slevin, who spent more than 22 months in solitary confinement despite not being convicted of a crime, is seen here in Dona Ana County Sheriff's Department photos, before and after his time in solitary. AP hide caption

itoggle caption AP