Moonbows over Kentucky.

The world's longest known cave system.

A theme park featuring a replica of Noah's Ark built to the measurements specified in the Bible.

An out-of-the-way wildlife haven with a rich and storied past of harboring thousands of fugitive slaves, or "Maroons" during the mid 1800s.

Nature puts on a spectacular show at this blowhole on the eastern side of Gran Canaria.

All unmarked mute swans on the Thames are owned by the Queen per a tradition that began in the 12th century.

According to the Guanches, the aboriginal people of the Canary Islands, the king of evil lives inside this volcano.

This unique rock formation is quite the local celebrity, although one day it may come crashing down.

An outdoor sculpture park of giant pink robots and post-apocalyptic Christmas scenes.

The so-called "Bridge of Thighs" in Palm Springs allows nudists to discreetly cross the road.

Scores of vintage street lamps shine along L.A.’s Miracle Mile.

These delicate buggers are some of the rarest fossils that have bubbled up from the Tar Pits.

First LEED-certified gas station in the United States.

These four islands right offshore have waterfalls, colorful lights, fancy buildings, and a secret purpose.

The awe-inspiring ship from the golden era of cruising has an incomparable history and a reputation as one of the world’s most haunted places.

In the middle of a busy airport, a statue honoring the astronaut who told Houston that Apollo 13 had a problem.

A museum of natural history, Edwin Carter's original log cabin home and workshop houses taxidermy specimens.

This open-air reconstruction of an Old West town, a cross between a theme park and a museum, provides an immersive historical experience.

One Austrian's singular yard is now preserved as a folk art garden of concrete wonders.

The world’s largest truck stop includes a barber shop, chiropractor, and a huge museum with antique trucks.

A wonderland of caves in eastern Iowa.

This whimsical sculpture garden is a local treasure.

These modest Midwestern formations are kin to Niagara Falls' impressive cliffs, more than 600 miles away.

Chilly air billows out from the entrance of an abandoned mine on a steep hillside, providing a refuge for Ice Age fauna and flora.