Two towns are linked by an engineering marvel masquerading as a boring suspension bridge.

The Cathedral of Salamanca has a number of unusual carvings but none so surprising as a modern astronaut.

Bordered by forest on three sides and the ocean on the other, the Great Dune of Pilat is the highest sand dune in Europe.

A memorial to the nearly 10,000 American soldiers laid to rest on the beaches of Normandy during WWII.

A medieval church with largest and oldest collection of Renaissance frescoes in France.

Exquisite examples prehistoric bas-relief carvings.

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

An Orthodox church built by the Royal Family for the Russian community exiled to the French Riviera.

This massive blockhead sculpture hides an entire library.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

This private skyway is filled with art and was expanded explicitly so that Hitler could appreciate a river.

A large grotto built in the 16th century amidst Florence's famous Boboli gardens.

Abandoned substation turned village treasure.

A surreal statue honoring Prague's favorite literary son.

Macabre astrological automaton clock dating to the late 1400s.

A whimsical bridge adorned with decorative dragons.

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

This massive subterranean fissure is known as the "underground Grand Canyon."

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

An ancient necropolis of magnificent tombs.

The ancient mosaics here are considered among the finest in the world, and serve as a stunning record of Greco-Roman daily life.

These tombs were built into the side of a mountain so that ancient angels could reach the dead.

Roman ruins top white travertine terraces formed by ancient hot springs.