Curious cave that stays a cool 56 degrees all year long.

The world's largest man-made underground caverns offer unparalleled underwater wonders.

Less a museum than a bizarre fantasy world created by artists and engineers.

Two hundred tons of pioneer artifacts were painstakingly recovered from a shipwreck at the bottom of the Missouri River.

This recently restored timepiece has stood all around Kansas City.

Four, 18-foot-tall badminton shuttlecocks lie scattered about the lawn of a Kansas City museum.

Cryptic messages embedded in the New York City sidewalk.

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

One of many reminders of Tesla's scientific contributions overlooks the falls which inspired him.

The largest earthwork effigy in the world.

Inside houses a vast collection of military aircraft and missiles spanning the ages.

Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

Oh, just a motel on the edge of the desert decorated with thousands of clowns conveniently located next to an abandoned graveyard.

A pair of giant roadside arrows are all that remains of a former Route 66 trading post.

This historic national park is covered in the stunning ruins of red rock pueblos.

This public square capitalized on a single Eagles reference to bring some life back to an Arizona town.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

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

Home to an endangered salamander, a full moon celebration, and a large spring-fed outdoor swimming pool.

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

A humid oasis combines recreation with exploration in a unique underwater cavern.

Meet manatees face-to-face at this zoo for native species.

In Florida, these naughty monkeys live on their own mini-monkey Alcatraz.

Disney's abandoned animal island is now an overgrown ruin that was almost the coolest attraction ever.