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

The oldest stone house in Paris was built by its most famous alchemist.

Notorious artist squat renovated into legal studios.

A surreal museum of extraordinary industrial objects.

The studio of Catalonia's most famous theatrical designer remains exactly as he left it.

This 1920s Dutch barge is now a floating bookstore.

An archive of ceramic eggs painted to record clowns' personal makeup designs.

Three small rooms at the back of the “official” church of London's clowns.

Traveling collection of amazing automata.

Artists and musicians now rule over this former rail station.

One of the world's largest collections of pathological specimens.

Repository for more than 22 million pickled specimens.

This wildly-tiled artist's palace is a living and growing account of the creator's life, loves, and labors.

A mysterious artist-run cabinet of curiosities and library.

The curios of pharmacist and collector Henry Wellcome.

The only university zoological museum in London houses extinct animals, bizarre natural history specimens, and a Micrarium of microscopic creatures.

This collection of illusory paraphernalia has been culled from the history of London's premier magician's club.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

A modern English garden of eccentric beasts, follies, and oddities.

This Netherlands museum holds a gloriously mechanical collection of ornate musical automata.

The world's only museum devoted to the wonders of fluorescence.

An Amsterdam street lined with antique shops each one dedicated to a different obscure collection.

Cat art as far as the eye can see.

An ancient passage filled with stalls selling used books, once frequented by Vincent Van Gogh.