The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

This innocuous New Mexico storefront was once the secret jump-off spot for Manhattan Project scientists.

This giant pocket watch is the third iteration of a local landmark that has been standing just off the Santa Fe Plaza for over 100 years.

Wedding chapel's mysterious spiral staircase said to be miraculously constructed.

This water tower slanted at an uncomfortable angle off the old Route 66 was an ingenious marketing ploy.

Whether or not you take the 72-ounce steak challenge, there’s plenty of history, fun and Texas-style food at this legendary stop along Route 66.

This constitutionally sound Muffler Man harkens back to the days these attractions were a must-see.

A sculpture made of 10 Cadillacs as a monument to the “Golden Age” of the American automobile.

A home designed to be on the cutting edge of comfortable, low-cost living.

This monumental Jesus is often referred to as "Our Milk Carton With Arms."

An extravagant western hotel where every floor is the "ground floor."

A beautiful botanical garden in the heart of the Natural State.

This historic hotel on Bathhouse Row in Hot Springs National Park has a storied history of gangsters and baseball greats.

This futuristically sylvan church is a glass-enclosed marvel of modern architecture.

The only brothel on the National Register of Historic Places.

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

The physical legacy of one man’s lifetime mission, following a near-fatal mine accident, to publicly proselytize for Christianity.

A bronze sculpture honors the 12 black students who attended the first integrated public high school in the segregated South.

A roadside music shop featuring a confounding series of folk art installations.

Thousands of pieces of art have been carved into the rock at the site of an ancient volcanic eruption.

In West Virginia, you can walk across the longest single-arch bridge in the Western Hemisphere.

John Wayne, Ronald Reagan, and other Hollywood actors have resided in this picturesque Route 66 hotel.

The entire history of the U.S. Space Shuttle Program is painted on an enormous roadside water tank.

Marvel at 400-year-old trees in one of the last remaining old-growth Appalachian forests.