This Route 66 classic sports a giant fiberglass rabbit that you can ride.

If drivers cross the rumble strip on this stretch of Route 66 at just the right speed it plays "America the Beautiful."

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

A clear blue swimming hole with hidden caves, still unexplored.

The Grand Canyon of Texas.

The walls of the iconic dome are hollow and have a secret stairway.

The beloved statue at the National Academy of Sciences is oh so inviting to sit on.

Look closely and you’ll notice that the color changes a third of the way up the tower.

While most wind tunnels test scale models, the "Cave of Winds" was large enough for actual airplanes.

A cavernous three-story, 43,800-square-foot basement that was forgotten about for 60 years.

An overlooked memorial honoring the local Washington residents who died in World War I.

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

The Pentagon is so large that it was planned like a city, complete with internal highway infrastructure.

This rare triple-jurisdiction drawbridge passes through Virginia, Maryland, and Washington, D.C.

A former major munitions plant that has been converted into a sprawling art space.

The narrowest house in America is seven feet of pure spite.

A 200-year-old building in the French Quarter that was to be Napoleon's home in the New World.

New Orleans' famous cemetery, located on the site of a former race track.

The oldest cemetery in New Orleans, resting peacefully for over 200 years now.

These half-buried combine harvesters just off Route 66 are an homage to the Cadillac Ranch.

A pair of giant legs paying homage to a poem, a king, and it would seem, socks.

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

Three hundred years of preserved Spanish colonial history in San Antonio.

Scattered around Atlanta are little doors with big charm.