"Not too many people can say they've had a nuclear bomb dropped on them, not too many would want to." — Walter Gregg.

A mysterious monument meant to be a guide into "an Age of Reason" was destroyed after an apparent bombing.

Mile-long cave system near Great Smoky Mountains.

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

A curious whirlpool formation supposedly capable of entangling or engulfing branches, tree trunks, or whole rafts full of hapless tourists.

A recreation of the doomed ocean liner in the middle of the Smoky Mountains.

This abandoned school has had many lives since the early 1900s, and all of them doomed.

The highest point in Tennessee, Clingmans Dome bears witness to the ravages of one type of insect.

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

An unfinished rail tunnel that has since been used to house cheese and bats.

A sculptor's dream castle turned fantastical ruin.

All that's left of the quintessential "cabin in the woods."

This airfield is home to a number of retired vintage planes in various states of disrepair.

Some North Carolina Cherokee have been keeping their history alive for decades with a single play.

The remains of the iconic train crash from the movie The Fugitive can still be found rusting along the Great Smoky Railroad.

Step back in time on this preserved 1800s farm.

Wild lights and sound effects turn a walk through some caves into an eye-popping 1960s tourist attraction.

An overgrown collection of miniature buildings still stand as evidence of one couple's obsession with The King.

Rotting dome home spotted near Chapel Hill, North Carolina.

Mysterious ancient boulder carved with petroglyphs in the mountains of Western North Carolina.

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

Ruins of an American Civil War iron forge still survive today.

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

An eerily abandoned stone tower is all that remains of a demolished dam on Cape Fear River.