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

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

The internal railway of one of the biggest steel plants in America has been transformed into a linear park with unique industrial views.

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

The graffitied ruins stand hidden within the Pennsylvania woods.

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

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

Collection of trolley cars in the woods represent one man's attempt to preserve transportation history.

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.

This replica of the Greek structure is in the heart of Nashville.

Enormous lake at the bottom of a unique cave system.

The mysterious wonder of an underground waterfall is illuminated by multicolored lights.

This woodland architectural installation acts as a camera obscura for the heavens.

One of the best places to see feral Colonial Spanish Mustangs in the United States.

A historic covered bridge, only one of two remaining in North Carolina.

A 120-year-old legend concerning an empty circular patch in the North Carolina woods.

Hidden amid a collection of trails is the site of a tragic crash.

This abandoned amusement park was built on a site with a dark history.

For two weeks every June, fireflies in the Smoky Mountains perform an astonishing light show.

The oldest arched-covered bridge in Virginia has truly withstood the test of time.

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

This maze-like slot canyon is a unique gem within an already fascinating geological area.

The skeletal white beams stand as a monument to religious dissent.