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

Enormous lake at the bottom of a unique cave system.

The secret city built by the Manhattan Project.

An abandoned town is hidden in Great Smoky Mountains National Park.

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

This winding road of 318 curves is a must-visit for (careful) motorcycle and sports car enthusiasts.

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

Mile-long cave system near Great Smoky Mountains.

In one of America’s oldest mountain ranges, a long-awaited section of a scenic highway is now open to the public.

This rare basilica nestled right in downtown Asheville is an architectural marvel, inside and out.

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

Once connected to the outside world by a single train track, this ghost town is looked after by the National Park Service.

Famous for its bio-luminescent inhabitants, known as "Dismalites" .

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

The remains of the iconic train crash from the movie The Fugitive can still be found rusting along the Great Smoky Railroad.

One man's vision and a labor of love of many.

Colorful collection of antique musical oddities.

Mussolini gave Cincinnati a bronze statue of Romulus and Remus suckling at a wolf's teats.

Hop on the train and tour an elaborate miniature town made completely of junk (including the train).

Knoxville’s architectural icon was the symbol of the 1982 World’s Fair, even catching the googly eye of Bart Simpson.

The highest point in Tennessee, Clingmans Dome bears witness to the ravages of one type of insect.

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