This Tennessee manse was built so opulent that the very utilities doomed it to fail.

The secret city built by the Manhattan Project.

Enormous lake at the bottom of a unique cave system.

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

This natural wonder drops 16 stories straight down through rare flora and streaming waterfalls.

More than five miles of underground passageways.

An unknown Hall of Fame in Jackson, Tennessee.

Every day a troupe of pampered water fowl walk the red carpet to their favorite fountain.

Visit this playground of waterfalls, caves and sinkholes.

Live long and prosper in Tennessee.

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

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

Rabbit Hash is a heaping slice of Americana from another era, with a very peculiar origin behind its unusual name.

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

World's largest collection of Coke-related items not held by the Coca-Cola company.

Moonbows over Kentucky.

This small museum is kept in a house that was integral to the genesis of Uncle Tom's Cabin.

This huge clock made of flowers and simple machinery was once used a political weapon.

This modern castle sat empty for decades before a fire inspired its builders to complete its luxury halls.

Unique tower has outlasted a takeover of the company.

Outstanding collection of 19th century medical instruments includes a life-size figure cast from as many as 200 cadavers.

Three courses accompanied by Christian rock.

A life-sized memorial to Harry L. Collins, the official corporate magician of Frito-Lay.

This 19th century mansion façade adorned with immigrant patriotism is a symbol of Louisville’s history.