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

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

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

Constant erosion has created a surreal landscape of bleached and preserved fallen trees.

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

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

Beautiful waterfalls grace a canyon visibly torn by a violent tornado.

An enormous natural sandstone bridge in Kentucky.

Prehistoric animals decorate this popular outdoor park.

The world's longest known cave system.

This historic bridge has weathered fires and floods and still stands, now abandoned, where it has stood since 1874.

This century-old roadside attraction is full of bizarre rock formations.

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

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

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

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

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

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

Visit this playground of waterfalls, caves and sinkholes.

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

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

Enormous lake at the bottom of a unique cave system.