Enormous lake at the bottom of a unique cave system.

Before its closure in 2002, this South Dakota mine was the largest and deepest gold mine in Western Hemisphere.

A crumbling ghost town on the South Dakota prairie.

Once a thriving town of 100, Argonne was abandoned around 1970.

The cliff and rock formations are made out of Sioux Quartzite.

The deserted railroad town had a last gasp as a ghost town attraction before being abandoned for good.

Thanks to a loophole in property ownership, this alleyway has become a cacophonous street gallery.

Hidden behind Lincoln's head is a 70-foot-long chamber containing enamel plates documenting American history, sealed in a teakwood box in a titanium vault.

The ravine where Jesse James supposedly performed an impossible jump to evade capture.

A royal relic from the time that gambling was accidentally made legal in South Carolina.

A haunting—but not haunted—chapel remains in the woods.

Hidden in this little-known town stands a piece of agriculture history.

An ornate abandoned schoolhouse hidden in the woods near a decaying mill town.

Take a stroll through this centuries-old tunnel of enormous moss-hung evergreens, nestled among the grounds of America’s first public sculpture garden.

A 1960s damming project turned one family’s hilltop cemetery into an island.

Replica of an old Esso filling station, complete with Wayne gravity pump and outhouse.

A nearly century-old amusement park is quietly decaying in a riverside forest in South Carolina.

Once luxurious, these oceanfront beach homes have been left to succumb to the elements as the beach is slowly washed away.

An old train trestle re-imagined as an Egyptian obelisk.

A replica of where the Last Supper was held.

The only working large-scale tea plantation in the United States.

The remains of a chapel created for convenience.

This natural wonderland is a unique chance to explore a Carolina bay, a mysterious geological formation of unknown origin.

Paths are maintained, but trees have taken over plots.