Historic medieval fortified city in southwest France.

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

The subterranean "lake" below the Paris opera house inspired the Phantom of the Opera's lair.

A 14th century bridge built as a fortress, where the devil lurks on one of its towers.

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

Sacked by Vikings, blessed by William the Conqueror, dealt a fatal blow during the French Revolution—these ruins have seen it all.

This charming cobbled backstreet is the most Instagramable street in Paris, much to the residents' annoyance.

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

This whimsical castle of grottoes was the labor of love of a French postman, and one of the greatest achievements of outsider architecture.

The very center of Paris is surrounded by a bevy of strange good luck rituals.

A horde of stray cats rule in this secluded Parisian cemetery under a bridge.

Paris' linguistic guide to the international language of, yes, love.

A public urinal so pretty, it was declared a national monument.

This unattributed sculpture in Amsterdam is hiding in plain sight.

This 22-floor tower's Skydeck offers panoramic views of Amsterdam.

An 80-year-old plane tree is devouring an iron bench at Ireland's oldest law school.

Fulham F.C. imploded once everyone excised its giant, hated tribute to the King of Pop.

The bizarre headgear looks like it was made for a fool, not a king.

Be on the lookout for the symbolic insect all over the city.

The remnants of a depressing public toilet are now a hub of ever evolving street art.

Lewis Carroll's White Rabbit or something else altogether?

A hill carving of the legendary dragon that terrorized the village of Bures in the Middle Ages.

A quirky "castle" formerly belonging to a famous British inventor.

This memorial to the thousands of Indian dead during WWI was callously used for target practice during WWII.