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The walls of these four caverns are filled with art that dates back to the earliest human presence in Europe.

This beautiful spit of land was once the summer playground of the king of Spain.

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

This Navarrese cave's history of witchcraft and pagan ritual is not just embraced, but recreated each year.

Lava stone structures possibly dating back to the 19th century may have been a stopping point for voyagers between ancient Egypt and the Mayan Civilization.

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

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.

Mountain where Jesus was first tempted by the Devil.

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.

Budapest's Communist-era statues, banished to the suburbs.

This statue pays tribute to the iconic musician in the place where he recorded his final studio album.

This historic covered bridge contains a series of macabre paintings that communicate one thing: everyone dies.

This memorial commemorating fallen Swiss Guards of the French Revolution has been called the saddest stone in the world.

A nearly 500-year-old sculpture depicts a man eating a sack of babies, and no one is sure why.

This demon atop the Notre-Dame de Paris looks utterly bored.

The final resting place of the "father of special effects."

This bridge was constructed from the rubble of the infamous Bastille.

A series of abstract, silly sculptures represent the works of a great modern classical composer.

How did a French journalist’s grave become the sexiest statue in the cemetery?

Medieval museum built over Roman baths that features famous tapestries of a lady and a unicorn.

19th century pendulum and a clock restored by a rogue group of guerilla artists.