Eastern State Penitentiary Historic Site 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. Known for its grand architecture and strict discipline, this was the world’s first true “penitentiary,” a prison designed to inspire penitence, or true regret, in the hearts of convicts. Tours today include the cellblocks, solitary punishment cells, Al Capone’s Cell, and Death Row.