The largest Art Nouveau complex in the world is a Barcelona hospital with a 600-year-long history.

This immigrant bridge once spanned the Thames but is now a fixture of an Arizona city.

Artists and musicians now rule over this former rail station.

These mysterious Viking chess pieces spent centuries hidden on a remote Scottish island.

This small museum located under the famous cube houses, is home to some 30,000 chess pieces.

These slanted cubic abodes are a creative if odd solution to a zoning pickle.

Old ships and machinery fill a historic harbor in the city that's home to Europe's largest port.

This hotel was once home to a steamliner company and became the final rest stop for Europeans heading to the New World.

The mysterious megaliths have enchanted and intrigued visitors for thousands of years.

Spend the night in this formerly abandoned traditional Scottish village.

America's most famous piece of self-built architecture.

A magnificent, iconic stone tower in the Scottish Highlands.

A whale's jawbone and a malfunctioning harpoon welcome you to the village of Bragar and its lore.

Half-size replica of the Taj Mahal.

Rock-cut cave complex filled with ancient Buddhist artwork.

This complex of vertically-excavated Buddhist, Jain, and Hindu monolithic temples in India's Maharashtra providence illustrates a spirit of tolerance characteristic of ancient India.

This "preacher's pulpit" once used for pagan ritual, is home to a new, and dangerous ritual.

Across the Pacific in a raft, a museum dedicated to Thor Heyerdahl's now legendary expedition.

Home to three historic ships from the age of Vikings.

A thin pane of glass keeps visitors from sliding off this futuristic skywalk.

Longest road tunnel in the world features an air treatment plant and the illusion of daylight.

A giant bug impaled on a 75-foot-tall needle.

This ghost town in Belgium will lose its street art when it ceases to exist.