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.

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

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

A winding district gerrymandered into the shape of a mantis.

An impressive collection is dedicated to the legendary beast.

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

A strange history museum, with items accumulated by a pair of globe trotting spies.

A natural history museum with an extensive collection of bird dioramas.

Once a bustling cotton factory, this early 20th-century building is now home to a thriving artspace.

Mile-long cave system near Great Smoky Mountains.

Enormous lake at the bottom of a unique cave system.

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

The secret city built by the Manhattan Project.

This architectural triumph is the only Frank Lloyd Wright house in Alabama.

What else would you call a playground hidden in Alabama's oldest and largest cemetery?

This iconic 1958 tower welcomes air travelers to Tucson with neon-lit letters and architectural style.

An abandoned Jazz Age dream home and con man's hideout in Death Valley.

Cherokee alphabet, proof of ancient North American Jews, or just a hoax?

Step back in time on this preserved 1800s farm.

A propulsion engine testbed that paved the way for the Space Shuttle launch sits without recognition at this rocket center.

Bananas are often left for the first monkey America ever recovered alive after being launched into space.

This museum showcases the history and contributions of the U.S. Army to the medical industry, both on the battlefield and off.

A Texas cave network is home to some of the world's most spectacular-looking and bizarrely named mineral formations.