1. Eastern State Penitentiary, Pennsylvania, United States
The Eastern State Penitentiary was the largest structure of its kind in the US at the time of its completion. Al Capone was held there during his incarceration. The prison was based on the principle of ‘reform’ rather than ‘punishment’. The design included a Neo-gothic style of architecture with complexes made-up of cell wings radiating in a semi or full circle array from a center tower. The towers ensured that there was constant surveillance. Prisoners lived a life of isolation here and the eerie presence can still be felt at this abandoned site.