The small cave that housed Tennessee's "first citizen."

Dinosaurs invade a suburban Nashville neighborhood.

The first full-scale tunnel built in America is short but scenic.

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

Tombstone of a dog that greeted passengers at the Southern Railway Depot.

The perfectly named cave drop is the deepest in the continental United States, almost matching the height of Seattle’s Space Needle.

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

Live long and prosper in Tennessee.

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

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

A bizarre roadside attraction and the first instance of miniature golf in the world.

This large cave is a summer home to thousands of bats and has a rich history dating back to prehistoric times.

More than five miles of underground passageways.

A natural sandstone bridge hidden in the Sewanee forest.

An ancient cave system in Tennessee’s Appalachian foothills converted to a 1,200-person music venue.

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

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

A rapidly disappearing authentic bit of the old south.

A charming monument to a very special dog.

An eclectic store sells obscure vinyl recordings of Charles Manson and Jim Jones, along with many other oddities.

A ghost town that was wiped out by a flood in 1940.

A cabin completely covered in coffee mugs, where visitors are welcome to leave one of their own—if they can find an empty nail.

You can find America's highest suspension footbridge at Grandfather Mountain in North Carolina.

The highest point in Virginia can only be reached by passing through ponies and flowers.