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

Behold the rickety wooden glory of the world's oldest operating roller coaster.

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

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

These disused steel furnaces are now haunting ruins that may one day be a national park.

One man's real life disfigurement inspired a lasting local legend surrounding an eerie tunnel.

This Pennsylvania cave holds evidence of the oldest known inhabitants of North America.

The internal railway of one of the biggest steel plants in America has been transformed into a linear park with unique industrial views.

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

This eerily well-preserved coal town was saved from destruction by a Sean Connery movie.

Pennsylvanian mass grave and possibly mass murder.

A stone arch leads to a cavernous 1930s spring house tucked away in the Pennsylvania woods.

These tourist trap caverns are said to be the former home of a legendary Pennsylvania Hermit.

In which a local geological marvel becomes a quaint roadside attraction.

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.

Over 100 concrete munitions bunkers are all that remain of a Pennsylvanian village seized by the US government.

Buildings that dynamite couldn't bring down were abandoned because of bathroom issues.

A train station that was abandoned by the coal industry and was later converted into a cocktail bar.

A modern ghost town whose inhabitants were driven away by the growth of nuclear power.

"Dark Sky Park" is heaven on Earth for astronomers, one of the rare U.S. locations with no artificial light pollution.

Frank Lloyd Wright's most iconic home dangles over a Pennsylvania waterfall.

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

Philadelphia boasts one of the best — and most often overlooked — traditional Japanese gardens in North America.