The last water-powered mill in Oregon is open daily for free tours and has a surprising history.

Overlooking Puget Sound sits a garden with a Buddhist prayer wheel and an elaborate labyrinth.

A beautiful 62-acre Catholic shrine and botanical garden.

Beneath the surface, something slithers. And if you find it, prepare to be slimed and glowing.

An abandoned railroad tunnel forgotten by time awaits inquisitive hikers.

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

The first public building in Savannah to offer air conditioning was a luxurious cinema that still operates today.

The largest puppetry museum in the United States houses the world's most complete collection of Jim Henson artifacts.

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

Suspended above the ground in a thicket of towering Georgia trees is a modern architectural wonder.

This collection of ferns from across the globe is the largest assortment in the United States.

Bad farming practices caused this unnatural natural wonder.

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

A Memphis park where you can walk the whole Mississippi River in one go.

Labor provided by Great Depression-era programs restored these 25,000 acres in Tennessee.

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 quirky local sculpture is quite literally a fish out of water.

This improbable contraption was passed down through five generations of industrious Tennesseans.

Hiding behind a grocery store is a spectacular cavern carved as part of an old limestone quarry.

This park contains one of the largest concentrations of cedar glades, a unique and rare ecosystem.

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

Mile-long cave system near Great Smoky Mountains.

Visit this playground of waterfalls, caves and sinkholes.