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

This museum pays tribute to the Cherokee leader who created a written language for his people.

This museum dedicated to an oft-overlooked support industry features a surprisingly moving brass diorama of a man being saved from a sinking car.

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

This tiny 19th-century tunnel was built so a man could move his cows from one field to another.

The bad-ass ride of a soul legend, housed in one of the world's few soul museums.

This limestone outcropping was once a ceremonial site for ancient Native Americans.

The "Jade Museum" is full of thousands of intricately carved works of art made from various precious stones.

This popular park is home to a sea serpent sculpture that now overshadows the twisted history of its creation.

Over a dozen Native American earth mounds dating back over 2,000 years dot this Tennessee archaeological park.

An engraved boulder marks the spot where Patsy Cline's life ended in a plane crash.

This park contains one of the largest concentrations of cedar glades, a unique and rare ecosystem.

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

The juke joint where legendary soul artists ate, drank, and made merry.

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

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

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

Walk the whole Mississippi River!

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

The secret city built by the Manhattan Project.

More than five miles of underground passageways.

Visit this playground of waterfalls, caves and sinkholes.

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

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