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.

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

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 sturdy, circular stronghold served as one of the forts that protected the Venetian Lagoon.

The origins of a large, medieval castle are shrouded in mystery, but now it's a delightful garden.

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

This curious, round temple is the oldest still-standing marble building in Rome.

It’s said this crypt was the setting for the tragic finale of the Shakespeare play.

The only visible reminders of an elaborate engineering project that kept the tower from reaching the tipping point.

A whale rib was used to advertise the store by the arch that offered exotic goods from far away.

One of the highest mountain passes in Europe has been ranked among the best driving roads in the world.

A copy of the famous statue can be found in this Florence piazza, along with one of the most breathtaking views of the city below.

Two stone columns flank the grand Venice square, but there were supposed to be three.

A slightly creepy gallery of plaster cast models in the same museum as Michelangelo's David.

The walls and streets of the ancient city are peppered with penises.

An extensive collection of reliquaries containing the bones of saints housed in the largest Catholic church in Venice.

These medieval skyscrapers dominate the skyline of this small Tuscan town.

Ancient snack bar of the Roman Empire re-opened.

Erotic art covers the walls of the largest ancient pleasure palace.

Venice's island of the dead.

Medieval torture techniques with a modern conscience.

Secret refuge and museum of the Duke of Florence.

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