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

Even France's favorite aquatic son Jacques Cousteau, couldn't get to the bottom of it.

Petting this mysterious iron monkey supposedly brings good luck.

A beautiful maze marks where three countries meet.

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

This historical Netherlands fortress still bears the marks of its single siege.

360° views of the city plus five floors of optical illusions and hands-on science.

For the holidays, the tallest broadcasting tower in the Netherlands turns into one of the world's tallest Christmas trees.

Hiding the longest subterranean river known in the world.

Historic medieval fortified city in southwest France.

The former home of a trailblazing surrealist is still filled with haunting dolls and grim paintings.

Colorful and chaotic stacked hotel in North Holland.

This giant urban staircase was built to keep the city's brave fighting men from getting waylaid in the red light district.

This narrow Ghent alleyway is an officially sanctioned street art tunnel.

This fairytale castle was built as a show of power but was nearly torn down thanks to its history of torture.

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

This centuries-old gothic monster has been converted into a sprawling, glossy bookstore.

This fairy tale forest hides scenes from some of the more obscure and bizarre Western nursery stories.

Incredible labyrinth of man made caves.

A little sculpture with a large wardrobe.

A 18th century graveyard and its astonishing cortege of macabre iconography.

Rotterdammers' dirty minds gave this santa a dirty nickname and cursed it to a life of wandering.

Meet the bronze beloved pet to a family of famous peeing statues.

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