Local lore says the devil built this beautiful medieval bridge to help a fleeing bandit.

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

A stunning 18th-century site where pilgrims ascend by a series of punishing stairs only to return via funicular.

This chapel is the site of a yearly pilgrimage that originated during the Middle Ages.

This Gallo-Roman sanctuary is dedicated to Serápis, god of the underworld.

Men in rubber-soled boots serve as your "brakes" on this toboggan ride Hemingway described as "exhilarating."

Dead weights honor the dead of Portugal's fishing industry.

This unassuming chapel in Portugal plays host to a ghoulish collection of bones.

Pagan monument converted to Christianity with the population.

Perhaps the most spectacular grotto along the Algarve coastline.

An aluminum skeleton brings Chinese mythology to the French shore.

The first island in the world designated a light-pollution-free astronomical observation point.

This stone quarry was used to make axes and other tools more than 6,000 years ago.

Wall after wall of this French seaside neighborhood is intricately decorated with seashells and corals.

The smallest port in France is named after the pirate who created it.

The sunken structure looks like the victim of a catastrophic flood.

A granite rock formation littered with various species of moss, lichen, and fern.

Europe's largest community of crocodiles and alligators.

This stunning, out-of-the-way Croatian monument commemorates a community's uprising against occupying fascist forces.

Croatia's towering concrete blossom grows from the site of a World War II concentration camp.

A tower marking the spot where Yugoslavia began its resistance against the invading Nazis stands neglected, but not quite forgotten.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

A forlorn fishing village on the coast of Labrador, full of shipwrecks and Spanish gold.

Hundreds of enormous icebergs drift through this waterway every year.