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

Moonbows over Kentucky.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

This structure among the trees was the result of divine inspiration.

More than five miles of underground passageways.

Live long and prosper in Tennessee.

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

A stockpile of childhood lunch pails turned collectibles.

The humble gravesite of the man who failed to cash in on his Pepsi-cola goldmine.

Enormous lake at the bottom of a unique cave system.

Mile-long cave system near Great Smoky Mountains.

Secret gardens just a few miles from downtown Atlanta.

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

A mailbox that saved a nature reserve.

A museum and doll store featuring a surreal and super sanitized version of where babies come from.

The uniquely-designed winter home and sculpture studio of Anna and Archer Huntington.

A historic covered bridge, only one of two remaining in North Carolina.

One of the oldest living oak trees in the Southeast.

North America's oldest authentic African Village.

Oldest unrestored plantation house in America that is open to the public.

Settled in 1696, abandoned after the Revolutionary War.

Amazing pre-Civil War ruins alongside a shallow, rocky river that hosts beautiful (but endangered) lilies.

One man's extraordinary topiary garden in a small South Carolina town.

Granite outcropping that the state's tourism bureau doesn't promote because of its delicate ecosystem.