A natural gas leak provides a flickering flame beneath a waterfall.

The remains of a community that was forced to move for a dam that never materialized still rot in this Pennsylvania park.

This might just be the TARDIS of bookstores.

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

A toxic ghost town sitting atop a massive coal fire.

A hidden alley in urban Baltimore is a haven for graffiti artists.

The land is home to swimming ponies and a legendary 18th-century treasure.

An eerie, decaying ghost town destined to fade into the forest.

This free, take-a-book shop seems like a trick but isn't.

It's not hard to see why the historic Peabody Conservatory of Music's library has been described as a "cathedral of books."

This abandoned dream castle and its cemetery look out over the city that once inspired their creation.

One day a year it is legal to jump off of this astoundingly tall bridge that spans an Appalachian gorge.

The oddly shaped, steam-spewing building is now an art studio and gallery.

The final resting place of two (or three) presidents, one vampire, and 18,000 Confederate soldiers.

An alternate history park where the Union Army loses the war... to dinosaurs.

Giant busts of 42 U.S. presidents are sitting in a field in Virginia.

A 300-yard long natural tunnel runs through a ridge deep in the Appalachian Mountains.

A small museum along the Susquehanna River is home to a rich collection of Native American artifacts.

A tradition unlike any other, this marks the site of the annual Groundhog's Day tradition.

This tiny New Jersey village has lived many lives but seems determined to remain a ghost town.

Hidden deep within New Jersey Pine Barrens is a massive graffiti wonderland.

For decades, it has disappeared and reappeared as water levels rise and fall.

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

This public space is speckled with the eerie remnants of a defunct amusement park.