Once one of the most polluted caves in America, now an environmental success story and a museum dedicated to caves.

One of the few surviving "Wigwam"-themed motels.

The world's longest known cave system.

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

This 19th-century building inadvertently preserved the handprints of its builders within its walls.

Step back in time on this preserved 1800s farm.

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

An ode to "The Queen of Appalachia."

While knives are the main feature in this store, visitors will also find dinosaur bones and meteorites.

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

This hotel was used during the Manhattan Project to house official visitors.

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

The secret city built by the Manhattan Project.

One of the Cemestos prefab homes built to secretly house thousands of Manhattan Project workers.

A 315-foot spire jutting out from the Blue Ridge Mountains makes for breathtaking views.

Practice your Dirty Dancing lifts in the manmade lake where Johnny Castle himself did.

Kentucky, Tennessee, and Virginia meet at this point in the Cumberland Gap.

The taxidermied body of a bear that was a casualty of a drug trafficker’s bizarre death.

Unique tower has outlasted a takeover of the company.

A pharmacy built in the shape of a mortar and pestle, now resembles a fancy cocktail.

Granite outcropping that the state's tourism bureau doesn't promote because of its delicate ecosystem.

The record holder for the world’s largest peach.

A royal relic from the time that gambling was accidentally made legal in South Carolina.

A Nessie-like monster supposedly lurks in this lake.