Gilded heaven for philatelists and architecture freaks, still in full working order despite sitting atop tremulous ground.

66,000 pieces of art, donated by one of the world's richest men.

Frida Kahlo's childhood home, now a museum of her life and works.

Part bookstore, part café, and part forest.

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

An early 20th-century bullring converted into a modern shopping center.

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

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

Two very green residential towers cleaning the air in one of Europe's most polluted cities.

An island on the Venetian Lagoon hosts this stone chair that has nothing to do with the King of the Huns.

This Roman statue is missing a limb from when the Venetians stole it from Constantinople during the Crusades.

This community on a small Venetian island has taken to painting their houses in bright neon hues.

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.