This museum houses an imposing skeleton army comprised of creatures great and small.

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

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

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

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

Giant topiary dog once played a role in a terrorist bomb plot.

A medieval village holds a very modern hotel.

One of the most spectacular bridges in Spain spans a narrow chasm that divides the city of Ronda.

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

Three bridges and one giant canyon make up this fantastic Spanish settlement.

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.

A founding document of the European Union was written on an island where Roman emperors once banished women.

Built to be the ideal penitentiary, this abandoned panopticon saw several revolts and even a prisoners' coup.

Also known as the Square Colosseum, this building is a prime example of fascist-era rationalist architecture.

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

This ancient market is often referred to as the oldest shopping mall in the world.

A detailed pachyderm supports Rome's smallest Egyptian obelisk.

Gods clash with machines in a power plant regenerated as a museum.

Venice's island of the dead.

Brass cobblestones mark the places where individual Holocaust victims were taken from their homes.

The spot where the fascist dictator made some of his most famous speeches including declaring war on Britain and France.

This hill made entirely of ancient Roman jars was simply a garbage dump to the people of the time.

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.