Red sandstone structures dominate this landscape, which has been inhabited for some 5,000 years.

This sinkhole in the Arizona desert is filled with carbonated, arsenic-rich water

The largest underground pedestrian tunnel system in the U.S. mostly caters to the people working in the offices above, but provides a great, air-conditioned way to traverse the city.

This library dates back to the late 17th century and was one of the first public lending libraries in England.

This Georgian Gothic building was created to shelter and feed deer.

Take afternoon tea in a 17th-century almshouse.

Makers and sellers of the original and finest York Ghosts.

This network of narrow, medieval passages has the most delightful name.

A century-old tradition has culminated in a small but singular collection of feline effigies.

Follow the original medieval paths that wind through this intriguing section of the city.

Hundreds of years ago, this lion-shaped door knocker could help a person accused of a crime find temporary safe haven in Durham Cathedral.

This sculpture commemorates a naturalist and an illustrator whose work was a forerunner to modern field guides.

Huge winged monument in the United Kingdom.

This century-old grotesque has a mysterious history and may not actually be a rabbit.

Though this bridge was originally built in the 12th century, only one of its 10 arches dates back that far.

An unusual stone chair can be found on the banks of the River Wear, not far from Durham Cathedral.

A monument with a strange legend involving a horse's tongue.

A rather grand, but tiny, folly on the banks of the River Wear associated with a Polish count.

These lamps were created to expel sewer gases after an event known as The Great Stink.

The "lost friend” is the most famous of the six moai statues that were removed from Easter Island.

The only airport with a people mover system designed by Walt Disney Imagineering.

One of corporate America's best-kept secrets is also one of the most publicly displayed.

Follow the steps, and this roadside artwork will teach you how to dance.

Once seen as a bit of an eyesore, this sculpture has become a staple of downtown Houston.