A remarkable time capsule of American manufacturing deep in Maryland coal country.

A hidden piece of Altoona's railroad history in a long-forgotten abandoned town.

The ruined remains of a coal mining ghost town are hidden within the woods.

Pennsylvania's highest point is spotted with boulders which were pushed to the surface by nothing but cold.

The universally beloved children's television figure is interred on a high hilltop in one of western Pennsylvania's oldest cemeteries.

Collection of trolley cars in the woods represent one man's attempt to preserve transportation history.

South Philadelphia is home to Keith Haring's only surviving in situ collaborative public mural.

This forgotten building was one of the few Philadelphia-area breweries to survive Prohibition.

Where America's first doomsday cult awaited the end of the world.