Natural history museum celebrating biodiversity with a parade of taxidermy animals.

Statue of death tucked in the University of Medicine courtyard.

A majestic lion statue guards this Parisian botanical garden, and feeds on an unsettling item.

Behind the pink curtain, Au Bonheur du Jour, an art gallery of erotic archives.

Remains of Roman amphitheater hidden in a sleepy quarter of Paris.

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.

The remaining relics of the patroness of Paris lie in a chapel under a striking double spiral staircase.

France's national museum of scientific and industrial instruments.

One of the oldest medical collections in Europe focusing on rare surgical instruments.

A lone cannonball remains lodged in the walls of the Hotel de Sens as a sober reminder of a revolution.

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

Notorious artist squat renovated into legal studios.

A Parisian exterminator's shop whose storefront displays stuffed rats hanging from traps.

With a history of slaughter, feast, and famine, remnants of the pork industry decorate this area--even its church.

A museum on the history of Paris, including a set of Napoleon's toiletries, Proust's room, and relics of the Revolution.

The celebrated eyesore created by starry-eyed sweethearts.

Most prolific publishing house in the 1600s open to the public.

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

Three floors of musical instruments coming from all corners of the world and hundreds of years of musical history.

A little sculpture with a large wardrobe.

Scattered throughout London are ancient remnants of the city's former bounding wall.

Ship-sized kinetic sculptural fantasy.

An unusual round church in London with a Templar past.