At 135 years old and counting, this historic print shop is heaven for poster nerds and music buffs.

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

Mile-long cave system near Great Smoky Mountains.

Railroad came. People came. Railroad left. Town died.

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

The secret city built by the Manhattan Project.

This replica of the Greek structure is in the heart of Nashville.

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.

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

All that's left of the quintessential "cabin in the woods."

Home of an evil witch famous within southern folklore.

Enormous lake at the bottom of a unique cave system.

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

The pan man stands as a testament to the functionality of American cast iron cookware.

The world's largest collection of porcelain "veilleuses-theiere," or night light teapots, includes four that belonged to Napoleon.

This mansion turned restaurant was once a pitstop for Al Capone during his travels.

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

All you ever needed or wanted to know about America's favorite whiskey, but not a drop to drink.

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

Home to drunken tower-climbing goats... seriously.

The first KFC is on the National Register of Historic Places.