What else would you call a playground hidden in Alabama's oldest and largest cemetery?

The secret city built by the Manhattan Project.

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

The oldest bridge in South Carolina may have been designed by the same man who created the Washington Monument.

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

Shaped like a big top tent, this memorial honors the victims of a terrible train wreck.

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

A strange history museum, with items accumulated by a pair of globe trotting spies.

This historic train station has been converted to a locomotive themed hotel.

This funicular railway rumbles along for a mile up the nearly vertical face of Chattanooga’s Lookout Mountain.

This museum dedicated to an oft-overlooked support industry features a surprisingly moving brass diorama of a man being saved from a sinking car.

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

This "Plant Farm Museum" is home to the divinely inspired and visionary outsider artwork of Reverend Howard Finster.

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

Crumbling ruins mark the site of a couple's grisly murder in the woods.

Just a few miles from downtown Atlanta is a trail covered in a crazy collection of outsider art.

The beauty of urban decay, hiding some dark secrets.

The Battle of Atlanta in 360 degrees, featuring a corpse that bears a striking resemblance to Clark Gable.

The remains of one of America's first radiation testing grounds still rest ominously in a Georgia forest.

Developers built a Walmart around one family's plot and constructed a mausoleum in the parking lot.