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

Mysterious rocks that ring musically when struck.

A recently abandoned psych ward at the end of Sanatorium Road.

This once luxurious Catskills resort is now a haunting ruin.

An abandoned castle owned and ignored by Masons carries a cursed history.

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

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

These mouldering mansion ruins remember a time when the Catskills were nothing but luxury.

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

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

A toxic ghost town sitting atop a massive coal fire.

A mine fire has been burning under the deserted town since 1962, but this church is still going strong.

Intricate storybook scenes are tucked inside these shadow boxes, which are tucked inside a library in the Pocono Mountains.

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

The dairy farm in upstate New York where nearly half a million people gathered for three days of peace and music in 1969.

This jail which was in service for over a century is now open for curious visitors.

Oldest existing wire suspension bridge in the United States.

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

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

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

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

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

The graffitied ruins stand hidden within the Pennsylvania woods.

Visitors to Salt Springs State Park are encouraged to literally put their two cents in Penny Rock.