In March 2015 a trip to Philadelphia, PA, USA took us to Eastern State Penitentiary. ESP was once the most famous and expensive prison in the world but stands today in ruin, a haunting world of crumbling cellblocks and empty guard towers. Planning began in 1787 at the home of Benjamin Franklin. I took 30 years to get to construction underway, with the opening in 1829. Inspired by humanistic principles of the Enlightenment period, it was to be a true penitentiary, a prison designed to create genuine regret and penitence in the criminal's heart. In the end this did not work and in 1913 they gave up the notion of rehabilitation by repentance.
Following the link above you can learn the full history and the current state of preservation at ESP.