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

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

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

Exquisite wall sculptures carved in secret by an early quarryman in an obscure corner of the Paris Catacombs.

A mechanized clock where a man fights off a dragon, crab, and rooster.

This overlooked, beautiful convent hides an original Hieronymus Bosch among its many treasures.

This medieval castle is filled with an eccentric collection that ranges from ancient Egyptian artifacts to taxidermy to a mummified hand that was cut off during a duel.

This grisly exhibit houses skeletons and weapons from a devastating 14th-century clash.

Medieval museum built over Roman baths that features famous tapestries of a lady and a unicorn.

Nature and beauty amidst pollution and industrial wreckage.

Finally, you don't have to be a pious Swedish seaman to relax like one.

The famous polar explorer stands outside the Royal Geographical Society's headquarters.

The world's oldest optical museum is an odd collection where the exhibits look at you.

The library houses an incredible collection of some of the world's most impressive books and manuscripts.

This home on a quiet suburban street is completely covered with vibrant mosaics.

An small and easily overlooked archaeology museum chock full of Egyptian artifacts.

English antique dealers with a taste for the unusual.

In this cobwebbed old operating theater, you can practically hear the screams of the unanesthetized patients.

The anatomical-pathological collection of a man who changed surgery.

Rebuilt remains of a temple to Roman god Mithras.

One part local history, 99 parts gruesome haunted house.

Eighty million natural history specimens call this gargantuan museum home.

This shop and gallery is a modern-day cabinet of curiosities, unassumingly positioned along an urban thoroughfare.

This Roman statue is missing a limb from when the Venetians stole it from Constantinople during the Crusades.