Made famous by 'Star Wars,' these troglodyte homes face an uncertain future.

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.

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

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 lurid German fountain plots the sad course of marriage from dating to death.

A castle from the Holy Roman Empire that hosts traveling youth... in its stables.

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.

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.

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

There has been an astronomical clock on this spot since the 14th century.

The castle was reconstructed to fit Kaiser Wilhelm II's romanticized vision of the Middle Ages.

A 16th-century fountain marks the site of a lost medieval cemetery once filled with mass graves.

This surreal statue brings a famous French novel about a supernatural cad to arresting life.

This statue was given to France by the United States to commemorate the centennial of the French Revolution.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

France's most famous cemetery, with some of its most curious tombs.

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

The world's oldest bookshop still in operation.

The comedy and tragedy of Oscar Wilde is preserved in a Dublin park, captured in a sculpture of colorful stone.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

Visitors can swim with vicious predators in Crocosaurus Cove's plastic daredevil enclosure.