Eastern State Penitentiary 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 prisoners. Its vaulted, sky-lit cells once held many of America's most notorious criminals, including bank robber "Slick Willie" Sutton and Al Capone.

Passholders are able to upgrade to a Night Tour: Summer Twilight, Surcharge of $5 per person at the box office applies.

Night Tours: Summer Twilight will be open every Thursday, Friday, Saturday and Sunday evening from May 25 through September 3 PLUS Memorial Day (Monday, May 29) and Labor Day (Monday, September 4).