This collection of over 50 classic pinball machines awaits visitors to downtown Roanoke.

Lines from a walking song are etched into a rock in Natural Bridge State Park.

Bubbling up from deep underground is the warm crystal clear water that fills the Warm Springs Pools, America's oldest spa.

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

A secretive collection featuring objects that were designed specifically for U.S. intelligence operations.

The remains of a failed attempt at medieval nerdery are hidden deep in the woods of Virginia.

For two weeks every June, fireflies in the Smoky Mountains perform an astonishing light show.

The world's largest version of this iconic puzzle cube is located in Knoxville, Tennessee.

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.

This stone incorrectly marks the 35th parallel, causing some territorial kerfuffles.

Abandoned for 60 years, this submerged bridge was completely forgotten until the lake was drained.

Once decrepit and slated for demolition, now one of the longest pedestrian bridges in the world.

This homegrown adoption center offers a wonderland of feline companionship.

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

This defunct, fortress-like prison has been the setting for several movies.

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.

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

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

Home to drunken tower-climbing goats... seriously.

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

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

Mile-long cave system near Great Smoky Mountains.