This 15th-century island fortress later served as home to the executioners no one wanted to live near.

This pink watchtower served as the seat of the Greek government after independence from the Turks.

A Bronze age settlement on the Greek island of Santorini might have been the inspiration for Plato's Atlantis.

Of course Salvador Dalí lived in a castle...

One of the few remaining ancient aqueducts described by Frontinus as 'the most solemn testimony of the Empire.'

The first mechanized factory in Spain is also one of the most significant mints in the history of money.

This magnificent castle grew from a small Moorish fortress, and reportedly inspired two iconic Disney castles.

The world's most elegant power lines.

The discovery of these rare, ancient artifacts led to the creation of a new museum.

The world's largest wooden structure.

The Roman city was the birthplace of various emperors and is home to one of the empire's most impressive architectural feats.

The ruins of an ancient stadium that hosted gripping chariot and horse races.

Once the grandest synagogue in medieval Spain, it now stands as a memorial of the 15th-century Jewish exile.

Cliffside houses provide a spectacular view from their perch above the valley.

This multi-level, aqueduct-footbridge hybrid is one of the greatest works of the Spanish Renaissance.

Translating as "The Jump of the Girlfriend," this stunning waterfall has a tragic legend behind it.

This ancient amphitheater was restored in the early 1990s.

The last of three massive blast furnaces that were once at the foundation of the Port of Sagunto economy.

A daily pyrotechnic celebration marks a beloved tradition during Valencia's festival season.

This amazing example of Valencian Art Nouveau looks more like a cathedral than a public market.

This house's itty bitty size means no humans allowed.

Walk into an underground archeological dig, the site of the Roman Forum that was once the center of Valencia.

Vibrant street art created with mixed media.

This architectural oddity is an oasis of green on the outskirts of Valencia.