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

This Memphis recording studio launched the careers of Jerry Lee Lewis, Johnny Cash, and Elvis Presley.

A failed utopian experiment for British expats in the American South is now a Victorian village frozen in time.

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

Walk the whole Mississippi River!

Railroad came. People came. Railroad left. Town died.

Mile-long cave system near Great Smoky Mountains.

This head-spinningly bizarre Depression-era art cave is wall-to-wall quartz and Jesus.

More than five miles of underground passageways.

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

Visit this playground of waterfalls, caves and sinkholes.

Better known as the "Body Farm," this unique research facility has been studying how human bodies break down since the 1980s.

Enormous lake at the bottom of a unique cave system.

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

The beauty of urban decay, hiding some dark secrets.

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

A mysterious monument meant to be a guide into "an Age of Reason" was destroyed after an apparent bombing.

The ruins of a resort and casino sit on the banks of this blue hole spring that pumps 70,000 gallons of warm, clear water every minute.

An eerie site of reverence for those who have completed an epic journey.

Built in 1785, this residence is the oldest stone house in Georgia.

More than a century after her death, Little Gracie Watson remains one of Savannah's most often-visited residents.

This historic oak tree has been around for over 300 years and might last for 300 more so long as it doesn't fall apart first.

Georgia's highest point was given its strange name thanks to a simple translation error.

Could this grave be the true resting place of legendary gunfighter "Doc" Holliday? Unclear.