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

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

A toxic ghost town sitting atop a massive coal fire.

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.

Dozens of houses in the Adirondack Mountains are reminders of a literal "cottage industry" to cure people of a deadly disease.

The summit Roosevelt conquered before he descended to become The Chief.

This 38-drawer structure claims the superlative title, but it isn't the world's only giant filing cabinet.

The world's largest piece of copyrighted artwork.

One of the last remaining World War II Victory Gardens in the U.S. is quietly growing across from Fenway Park.

One of the now-less-hidden floral gems of the "Emerald Necklace."

The hill that gave the Massachusett tribe, and later the state, its name.

The oldest playground in America.

This supermarket is suspended 25 feet above an interstate highway.

America's "second most important bell" is a contentious spoil of the Civil War.

Once the largest gravity dam in the world.

This evocatively named natural crevasse was created by a torrent of water that smashed right through a granite deposit.

A comic book store got the road by its shop officially renamed after Superman's girlfriend.

A small obelisk commemorates the launch site of the world's first liquid-fueled rocket.

A grave surprise in the downtown area of New England's second-largest city.

On a side street near the interstate is the building where the famous anarchist once owned an ice cream parlor.

A spooky and decrepit mental health facility is slowly being replaced with newer digs.

Once a kitschy symbol for a gift shop, this 38-foot seahorse is now a staple roadside attraction.

Since 1947, this living history museum has been providing an immersive look at life in Plymouth Colony.