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

Don't get it twisted: This is the oldest pretzel bakery in the United States.

In the bowels of a 19th-century brewery lurks a fine-dining restaurant offering an array of themed feasts.

This extraordinary Depression-era expenditure was modeled after a postcard of a Mediterranean hotel.

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

A local prank turned town icon.

The oldest automobile museum in the United States.

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

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

It marks the spooky spot where the bodies of two young boys were found in the 19th century.

Where the famed frontiersman was born, raised, and survived Quaker intrigue

This abandoned iron furnace was one of the first to use coke—a type of high-carbon fuel—to make iron.

An abandoned asylum incorporated into a college campus.

Once home to a thriving oil industry, this town now sits eerily abandoned.

Two insane asylum bodies embalmed by an amateur.

This historic furnace was once used to produce cannonballs during the Civil War.

The penultimate and final resting places of British General Edward Braddock—minus a few bits and pieces.

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.

Detroit’s downtown castle is one of the oldest structures in the city.

Opulent downtown movie theater now houses cars as an indoor parking garage.

To truly appreciate Detroit's landmark skyscraper, you have to step inside.

A Beaux-Arts triumph set to become Ford's innovation campus

The 80-foot tire that looms over Michigan's I-94 was once a Ferris wheel in the New York World Fair.