Enormous lake at the bottom of a unique cave system.

North Carolina's finest examples of Native American pictographs have survived for 5,000 years.

John Hendrix predicted the creation of the "Secret City" built as part of the Manhattan Project.

Mysterious ancient boulder carved with petroglyphs in the mountains of Western North Carolina.

All that's left of the quintessential "cabin in the woods."

Cherokee alphabet, proof of ancient North American Jews, or just a hoax?

This road in the Great Smoky Mountains was supposed to assuage a displaced community, but ended up a $52 million dead end.

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

Over 200 people were buried here with only a small stone to mark their final resting place.

Mile-long cave system near Great Smoky Mountains.

American involvement in World War I officially ended in 1921 in New Jersey, three years late and thousands of miles from the battlefield.

This Old West eatery along America's Loneliest Road was originally a stop on the Pony Express.

A slanted tomb honors the faithful, furry companion of the Georgia Tech student body.

Like Mars, but much closer.

This stone is a marker of one millionaire's personal vendetta against gravity.

A cult archaeology conspiracy theory claims these West Virginia petroglyphs were written by Irish monks in Ogham.

These strange large stones served as a campsite and lookout post for generations of Native Americans.

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

These early tent-shaped grave coverings are unique to Appalachia.

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

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

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.

Live long and prosper in Tennessee.