Enormous lake at the bottom of a unique cave system.

A hidden oasis just two minutes from downtown Atlanta.

A little-known mural reveals the hydrological reason for Atlanta's founding in this location.

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

The world's first time capsule lies behind a welded steel door in Atlanta.

An unusual art exhibition in a suburban yard is designed to awaken the souls of those flowing by.

One man has spent decades faithfully constructing this unique brick and cinderblock castle.

Better known as the "Body Farm," this unique research facility has been studying how human bodies break down since the 1980s.

Like Mars, but much closer.

They call this long foot bridge a swinging bridge, but really it's the bouncing you have to watch out for.

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

A historic dam made famous for its turbines and feature in a Hollywood classic.

This winding road of 318 curves is a must-visit for (careful) motorcycle and sports car enthusiasts.

Mile-long cave system near Great Smoky Mountains.

Paranormal investigators claim this abandoned asylum is the most haunted spot in the eastern U.S.

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

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

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

One of the largest-ever mental hospitals now sits abandoned, surrounded by 25,000 unmarked graves.

Hop on the train and tour an elaborate miniature town made completely of junk (including the train).

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

Where school buses go to die and be reborn as whimsical works of art.

An abandoned bait shop with a front lot filled with storage boxes.

Performers, intricate sets, and a real speakeasy tell the story of the 18th Amendment.