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

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

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

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

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

Supplies are schlepped up by llamas at this century-old inn, accessible only by hiking trails in the Great Smokies.

Overlooking the Colorado Convention Center is this giant sculpture made from thousands of triangles.

Neal Cassady may still have an open tab at one of Denver’s oldest watering holes.

While comics are the main attraction at this megastore, the second floor plays host to an exhibit fit for a museum.

The spot in the Mile-High City that's exactly 5,280 feet above sea level (at least for now).

A Rocky Mountain city provides a happy ending for a pinto pony and his Brobdingnagian red chair.

One of the greatest boxers and humanitarians to ever live chose his hometown as his final resting place.

The largest cemetery in Louisville is the final resting place of Col. Sanders and Muhammad Ali.

The grave of the iconic Kentucky Fried Chicken mascot features a bust of the man behind the goatee.

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

The Midwestern United States' tribute to Michelangelo is a foam statue sprayed with gaudy gold paint.

From the Difference Engine to the Cray-1, all under one roof.

This elaborate towering structure was once famed for its revolutionary height.

An idyllic mineral hot springs facility with a more-than checkered past.

A museum celebrating rare American motorcycles where everything runs—and none of it quietly.

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

An ode to "The Queen of Appalachia."

A Nessie-like monster supposedly lurks in this lake.

This North Carolina museum is keeping the pinball craze alive, with a little Space Invaders on the side.