A flat slab of stone perched hundreds of feet above the Gasconade River in the northern Ozark mountains.

European castle ruins in an American state park are actually the product of death and grief.

Community bookshelf of 25-foot-tall book spines.

Antiques and recycled art surround this cabin designed to resemble a 19th-century schoolhouse.

Locals call this magical moss-covered walkway the "Emerald Path."

Gnarled canopies of pink and purple wildflowers arch over the trail to the summit.

Follow the path behind this treat-slinging camper van to a sculpture garden in the forest.

The famous bell was secreted away and hidden in a church in Allentown during the British occupation of Philadelphia.

A winding, cliffside stretch of road overlooking the Delaware River.

One of the first commercially successful anthracite-powered iron-making operations in North America.

Featuring the largest CinemaScope screen in Pennsylvania, this drive-in has entertained moviegoers for more than half a century.

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

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

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

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

The graffitied ruins stand hidden within the Pennsylvania woods.

Board a mine car and descend the #190 slope 300 feet underground into the Clark Vein of coal.

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

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

One of the U.S. Forest Service's only mansions is outfitted with a dinner table for floating food.

The museum moved on, but the diorama remain.

Largest outdoor staircase in the United States.

This is the last hand-cranked chain ferry of its kind in operation in the United States.

Once a home for cows and hay, this barn has been transformed into an event cathedral.