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

Mile-long cave system near Great Smoky Mountains.

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

The scant remains of this flooded historic village can be explored in one of the most remote areas of the Great Smokies.

Mysterious library of an infamous financier and spiritual seeker.

One person's lost luggage is another person's treasure.

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

The largest cemetery in the American Southeast is a hidden gem near the heart of Atlanta.

One of the world’s largest collections of paper memorabilia chronicles 4,000 years of papermaking.

Healing Springs that once ran red with soldiers' blood.

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

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

The ruins of a paper mill destroyed during the Civil War still tower over a tributary of the Chattahoochee River.

The ruins of a cotton mill that was burned in the Civil War are still hidden in a Georgia forest.

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

A vast collection of rare, historical, and vintage supercomputers.

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

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

This historic train station has been converted to a locomotive themed hotel.

More than five miles of underground passageways.

One of the world's largest automobile junkyards is a unique landscape of metal and moss.

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

An abandoned 19th century quarry in the middle of the woods, remade by unnamed wanderers into a massive series of rock thrones.

For over 80 years, Mayan ruins stood proudly in a most unlikely location.