A small cave hidden deep within the Jenny Jump State Forest.

The only statue of its kind to commemorate Washington's beginnings as an officer of the British Colonial Militia.

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

This red-eyed chrome beast pays homage to the popular modern myth of West Virginia's insectoid monster.

The site of the one and only battle of Lord Dunmore's War.

Pennsylvania's own Roswell-style UFO mystery.

The mounds at this site were reconstructed with the help of archaeologists and historians.

A slab of sandstone covered with mysterious 1,000-year-old rock carvings from a vanished North American culture.

At the center of this cemetery stands a 2,000-year-old burial mound of the Adena culture.

The largest earthwork effigy in the world.

An unusual, super-sized grocery adventure awaits in an Ohio suburb.

There aren't too many operational funiculars around, but Pittsburgh has two!

The last remnants of Fort Pitt also hold the distinction of being the oldest structure west of the Allegheny Mountains.

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

The mortal remains of a Russian prince, priest and paranormal investigator who came to America in 1792.

Rusting away on the edge of New Jersey are the remains of a Cold War missile launch site.

This scout retreat, still in use today, was the filming location for the original “Friday the 13th” film.

The world's third-largest crystal sphere has sat in the Penn Museum since 1927 with the exception of one outlandish theft.

This elaborate towering structure was once famed for its revolutionary height.

The largest university building in the West is a gothic masterpiece containing dozens of theme rooms based on different countries.

Ant sculptures march up the side of what used to be an iconic spot in punk rock lore.

A layered tribute to the work of mosaicist Isaiah Zagar.

A well-preserved example of an early industrial operation in the northeastern United States.

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