Eastern State Penitentiary (photogenic cellblocks and 'Terror Behind the Walls')

Eastern State Penitentiary, opened in 1829, is known for its ruined radial cellblocks and stark, vaulted corridors that have become a frequent subject of photography and online sharing. Each autumn the site produces 'Terror Behind the Walls,' a large haunted attraction that generates additional widely shared images and video. The penitentiary operates as a museum and historic site, offering tours that emphasize its architecture and history.