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

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

One of the oldest living oak trees in the Southeast.

A nude beach alongside a washed-out road.

Disney's abandoned animal island is now an overgrown ruin that was almost the coolest attraction ever.

Fascinating military history, awe-inspiring wildlife encounters, and endless outdoor adventures draw people to this sprawling park.

These craggy limestone outcrops offer a glimpse at a unique piece of Florida geology.

Public works and national defense project meant to carve a canal all the way across the state of Florida.

This spooky road cut through a mound of ancient coral might be haunted by a witch.

Mariners once used this prehistoric landfill as a navigational landmark.

One of the world’s largest and deepest freshwater springs, where mastodons once roamed.

An underwater statue of Christ blesses the depths off Key Largo.

A humid oasis combines recreation with exploration in a unique underwater cavern.

This fairytale-inspired cottage was created by a university literature professor.

The only Florida state park with publicly accessible caves.

This ancient octopus-like tree was saved from destruction thanks to shady reporting.

A hidden beach at the end of a tunnel of mangrove trees.

An underwater city for the dead.

An immense cave that has served as an outlaw's treasure trove, an underground dance hall, a nuclear fallout shelter, and much more.

Campus tradition says couples who walk beneath this enormous oak will stay together forever.

A free, canine-friendly alternative watering hole near the more famous Barton Springs.

This beautiful grotto is one of those places where you can't believe you're just outside Austin.

A Texas cave network is home to some of the world's most spectacular-looking and bizarrely named mineral formations.

The Grand Canyon of Texas.