This Boy Scout retreat acted as "Friday the 13th"'s original Camp Crystal Lake.

The remains of a community that was forced to move for a dam that never materialized still rot in this Pennsylvania park.

It would take 35 firetrucks to fill this enormous glacial pothole.

Once the world's largest reinforced concrete structure, this abandoned bridge now beckons urban explorers.

This huge, disused viaduct is now a crumbling concrete underworld of covered in years of graffiti.

The only geyser in the state of Pennsylvania is caused by pressure from an abandoned coal mine outside of the ghost town Centralia.

This park contains a number of standing stones meant to heal and inspire.

This abandoned Poconos resort is haunted by a history of kitschy romance and a violent fugitive.

These beautiful ruins deep in the Pennsylvania woods are thought to have been a ski lodge or a speakeasy, but no one really knows.