Twelve grave-faced marble angels guard the emperor's tomb at Les Invalides.

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

A 400-year-old church covered floor to ceiling in ex-voto offerings from the faithful.

The celebrated eyesore created by starry-eyed sweethearts.

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

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

Walk upon the mementos of the dead in this Parisian courtyard paved with medieval tombstones.

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

Incredible labyrinth of man made caves.

Pull up and have a drink at a museum filled with hundreds of years worth of shipwreck artifacts.

Rare wooden escalators lead deep down into an otherwise staggeringly monotonous tiled tunnel.

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

Building Men of War and Indiamen from Holland's Golden Age.

This giant wire frame man sculpture is crouched in contemplation.

The world's first interactive human body museum also serves as a chair for a giant orange man.

A 'living museum' in Leiden, the oldest of its kind in the Netherlands.

The Bloemen Route, or “Flower Route”, stretches 25 miles through prime Dutch tulip country as a result of “tulip mania,” the world’s first economic bubble.

Colorful and chaotic stacked hotel in North Holland.

The world's first zoo for microbes collecting the horrible and wonderful things living on and around us.

Established in 1638 to battle the Black Death, Hortus Botanicus Amsterdam is a treasure trove of rare flora.

The attic of a four-century-old canal house hides a clandestine church.

Three connected pink triangles memorialize persecuted gays and lesbians throughout history.

A beautifully eclectic mix of architectural styles.