One of the best-preserved medieval streets in Europe.

A minotaur, a labyrinth, and a dubious restoration pull in visitors from around the world.

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

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

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

This home designed for chocolate magnate Antoni Amatller is an exquisite treasure-box of Catalan Modernism.

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

This colorful statue welcomes visitors to a Barcelona park.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

This small, ancient Roman temple was once a church dedicated to the patron saint of penitents.

St. Francesca Romana, patron saint of drivers, resides in the church she founded.

A mysterious chasm in the heart of the ancient Roman Forum, the Lacus Curtius was once believed to be a gateway to hell.

An ancient Roman temple first dedicated to an emperor's wife is now a church.

The remains of this 2nd-century Roman temple are incorporated into a modern building.

This basilica is dedicated to two saints, one of which is known more for his famous quote.

Inside this building is another country within Rome, a sovereign entity without a physical territory.

Ancient ruins hidden underneath a modern luxury hotel.

Believed to be the remains of the lost Temple of Minerva, this nymphaeum has been known by its misnomer to this day.

A freedman baker’s lavish tomb has a relief showing various stages of Roman bread making.

One of Catholicism's four major basilicas has a series of papal portraits that are said to predict the end of the world.

A whimsical bridge adorned with decorative dragons.

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

Split's smallest church, and one of its oldest, has been reconstructed inside the city's Roman walls.

Gargoyle head that brings good luck.