This one-time health resort was used by aristocrats around the world.

A whimsical bridge adorned with decorative dragons.

The abandoned village of Skarð aptly illustrates the idiom "Don't put all your eggs in one basket."

The Habsburgs' royal collections of art and wonders.

The crypt of the imposing Stephensdom holds royal intestines and thousands of skeletons.

An underground city of salt.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.

The world's largest solar furnace uses 10,000 mirrors to concentrate the sun's rays to generate power.

Historic medieval fortified city in southwest France.

A 14th century bridge built as a fortress, where the devil lurks on one of its towers.

One of Australia's largest secondhand bookstores.

Come for the flowers, stay for the bats!

Europe's largest prehistoric mound – burial site of a legendary king?

Famously misunderstood wonder of the ancient world

The oldest working mechanical clock in the world.

65 million-year-old chalk outcroppings mark the end of the Jurassic Coast.

A island reachable by a causeway at low tide is possibly one of the earliest Western European locations to be identified in text.

Fascinating town where normal life interfaces with the occult.

Cliffs full of fossils at the portal to England's Jurassic Coast.

A midnight snack that lights up the night.

One could not be blamed for literally walking all over this supposed landmark.