This circular artwork represents the ancient microscopic organisms that created the chalk foundations of the North Downs Way.

This volcanic crater lake is renowned for its perfectly round shape, stunning blue-green waters, and unique geological properties.

This sea-based blowhole releases seawater when waves hit the coastal caves.

Since 1985, this Victorian home has operated as a museum filled top to bottom with American-made glassware.

A mysterious castle "in the clouds" has had many lives including a radar bunker, dog hotel, and conference center.

This historic suspension bridge is one of three remaining swinging bridges in Michigan, and one of the few swinging bridges left in North America.

What looks like an ordinary house from the outside is actually a rotating sculpture.

Centuries-old columns from French monasteries provide structure for this courtyard within an Ohio art museum.

This rural Australian restaurant claims to be the only restaurant in the world to be built almost entirely of sea shells.

Works from the golden age of Mexican muralism can be found inside a typical city market.

Named after and designed by women, this unique cultural center is an early 20th-century mansion covered in a modern shell.

This meticulously reconstructed early medieval settlement offers an immersive experience of daily life in an Anglo-Saxon community.

This impressive gate is the only remaining remnant of a Spanish naval station.

These colorful staircases can be found around Goa’s capital.

The oldest civic library in Italy can trace its foundation back to 1619.

A small tower where a philosopher once speculated on human nature and morality.

This unique blend of Japanese and Western architecture provides a glimpse into the lives of the Japanese elites who once ruled Taiwan.

Tulsa's historic skyscrapers define the oil boom era of Art Deco construction, and are known for their ornate arched lobbies.

A ghostly mansion in the middle of downtown Tunis.

One of Scandinavia's largest mosaics pays tribute to Danish art and science luminaries.

Over 70 independent businesses have set up shop in this former Victorian department store.

One of London’s rare Tudor-era buildings is a fate-defying gatehouse for a church.

This seven-sided Romanesque chapel is regarded as the oldest building in Rovinj.

This 19th-century prison once held Irish revolutionary Constance Markievicz, writer Frank O’Connor, and a nine-year-old pickpocket.