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.

An architectural statement of artistic intent smack in the middle of Providence, Rhode Island's Colonial uniformity.

Books bound in human skin and H. P. Lovecraft's letters are among a few of the treasures this library has to offer.

The final resting place of two (or three) presidents, one vampire, and 18,000 Confederate soldiers.

An interesting decoration on this historic site, this weathervane comes with as many legends as it does questions.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

The site where Charles Dickens gave his first public reading of "A Christmas Carol" in the US.

The American Revolution was galvanized into serious action due to the tragic clash with British soldiers that occurred at this location.

Salute the leader of the proletariat.