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

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.

These hooded graves are the only of their kind in the United States.

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

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

The graffitied ruins stand hidden within the Pennsylvania woods.

Narrow gorges and deep pools created by long-ago glaciers.

This demolished goliath of American industry once loomed over the depressed town it once made thrive.

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.

A field of nothing but boulders which resembles a giant's gravel driveway.

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

This hollow steel globe is the second-largest in the world.

Art Deco urban decay at this historical building.

A water pumping station disguised as a residential home to assuage concerned neighbors now tricks most passersby.

This fallen red oak tree has been transformed into a piece of trailside art.

There is beauty and history in the ruins of this former company town.

The site of the worst mining disaster in Ohio's history.

This park pays homage to the region's rich industrial history of brick making.

The remains of a massive blast furnace in what was once one of the country's largest iron-producing regions.

The only remnant of a small mining town is an abandoned railroad tunnel that is steeped in ghostly lore.

Hikers can still stroll beneath the long conveyer of this abandoned mining facility hidden in a West Virginia river gorge.

The remains of one of the last mining camps developed on the New River.