This image is from the Eastern State Penitentiary in Philadelphia. It is an eerie yet compelling location. It seems to be a mecca for Urbex photography although it isn't an abandoned building but rather an old prison that is now a historical site and museum. Tours are conducted daily and visitors are invited to wander throughout most of the prison. The prison was built in 1829 and was the largest and most expensive public structure in the country. The penitentiary resembles a hub-and-spoke consisting of an octagonal center connected by corridors to seven cell blocks. Each block contains cells that were 8 x 12 feet. As I walked through the penitentiary, I thought about the convicts that were sentenced for 10-20 years and how terrifying it was. I'd probably go bonkers after 10-20 minutes.
This particular image was a cell block of the non-public part of the penitentiary. We were able to get a tour of this section as part of Denise Ippolito's excellent Philadelphia workshop.