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.

Secret refuge and museum of the Duke of Florence.

The pile of books behind the dignified writer gave the statue a most undignified nickname.

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

Go inside to really appreciate this 500-year-old technological masterpiece.

For decades, Puerta del Sol has been illuminated by a giant, guitar-wielding bottle of sherry.

Over two centuries old and counting, Madrid's massive botanical garden contains one of Europe's only desert environments.

Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

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

Occupied for six centuries by Franciscan Order nuns, this monastery is an amazing ode to Catalán Gothic architecture.

A vista of the city and sea from atop the little-known viewing deck on an unassuming Columbus statue.

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.

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

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

A beautiful but toxic fountain of mercury.

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.

A monument to the three wars that led to German unification towers within a Berlin traffic circle.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

The most visited, and possibly most controversial, museum in Germany.

The celebrated eyesore created by starry-eyed sweethearts.

Claude Monet was baptized in this lavishly ornate Paris church.

Natural history museum celebrating biodiversity with a parade of taxidermy animals.

In the best of all possible worlds, everyone will get a chance to see this statue in which Voltaire's heart is interred.