Climb inside an iron crystal magnified 165 billion times its normal size.

From Tintin to the Smurfs, Europe's greatest graphic icons are celebrated in a grand Art Noveau gallery.

Lavish royal estate punctuated with heated greenhouses.

This collection of over 50 murals celebrates Brussels' rich history as the self-proclaimed home of the "comic strip."

A little sculpture with a large wardrobe.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

The vibrant buildings in the “capital of the comic strip” celebrate the art form that made it famous.

Perfume museum and library.

The only remaining collection of flayed figures made by French "madman" Honoré Fragonard.

Abandoned railway line circling the city of Paris.

A modern-day Lascaux cave underneath Paris.

The ruins of a Duke's bucolic dream, where camels once roamed alongside "Dutch" windmills and faux-Italian vineyards.

The curious underground history of keeping Paris clean.

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

Original cabaret handbills, posters, and feline artwork are a purrfect highlight of the Museum of Montmartre.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

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

A Parisian cemetery where the elite and artistic are interred beneath an eccentric collection of tombs.

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

A French artist's vague warning hangs over Belleville.

Pitié-Salpêtrière was the dumping grounds for women who received the dreaded diagnosis of "hysterical."

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

The first green space constructed on an elevated viaduct.

Site of a classic 19th-century physics experiment to prove the earth is rotating.