Eastern State Penitentiary had the most with 204,000 ... Read more about the most popular abandoned buildings in the world at Travel + Leisure.

This abandoned prison was once home to some of America’s most notorious criminals, including Al Capone. Eastern State Penitentiary’s eerie architecture and dark history make it a magnet for ...

The castle-like Eastern State Penitentiary is one of Philadelphia's most important historic sites. Having opened in 1829, this Quaker-inspired prison sought to reform prisoners using isolation and ...