This former maximum-security prison is creepy, sobering, and supposedly haunted.

The small cave that housed Tennessee's "first citizen."

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

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

Over 20,000 sets of spice shakers reveal the surprisingly telling history of our most basic spices.

Live long and prosper in Tennessee.

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

A recreation of the doomed ocean liner in the middle of the Smoky Mountains.

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

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 secret city built by the Manhattan Project.

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

Wild lights and sound effects turn a walk through some caves into an eye-popping 1960s tourist attraction.

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

Home of an evil witch famous within southern folklore.

Enormous lake at the bottom of a unique cave system.

This bridge uses an inverted bowstring truss and is believed to be the only of its kind in the United States.

Learn about the history and craftsmanship of carousels inside this museum located in a former post office.

The crash of this great airship signaled the beginning of the end for dirigibles.

This NASA test station is home to some of the world’s largest and most powerful space environment simulation facilities.

A circle of giant painted vases in the former pottery capital of the United States.

This massive airship factory is so large that it has its own indoor weather.