This stunning iron gate designed by Modernist architect Antoni Gaudí is filled with mythic symbolism.

One of Antoni Gaudí’s earliest buildings, built between 1886 and 1890 for the industrialist Eusebi Güell.

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

Step inside the first house designed by Catalan architect Antoni Gaudí, considered to be one of the first Art Nouveau buildings.

The 2,000-year-old Roman columns are hidden within Barcelona's Gothic Quarter.

The streets of a sleepy Spanish town proudly exhibit some of the world's finest graffiti.

The bell that resides above this small chapel is actually a converted bomb.

The blowhole bursts spectacularly right next to the buildings in a medieval seaside town.

This Oaxacan town is known for its colorful fantastical creatures hand-carved by local artisans.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

A massive marble foot is tucked away in a small alley near the Pantheon.

This Italian stadium makes liberal use of fascist statuary to evoke classical sporting arenas.

Romans decided this 16th-century "talking statue" was so ugly, they named it after a primate.

Also known as the Square Colosseum, this building is a prime example of fascist-era rationalist architecture.

A detailed pachyderm supports Rome's smallest Egyptian obelisk.

This ancient market is often referred to as the oldest shopping mall in the world.

Hanging within this medieval church are the bones of a beast allegedly slain by a fourth-century saint.

A modern sliver of architecture in Roma.

Brass cobblestones mark the places where individual Holocaust victims were taken from their homes.

A forgotten "city of water" underneath the famous Trevi district.

This large, circular tomb is the final resting place of the first emperor of Rome.

A complex, nine-layer maze on the grounds of a Venetian doge's playground.

A sinister pyramid in the Frari contains the heart of the famous neoclassical sculptor.

Installed in an act of one-upsmanship, the annual sundial in this church is also a symbolic victory for the Gregorian calendar.