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

A counter-culture bookstore like no other hides in plain sight in the streets of Paris.

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

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

A surrealist timepiece by the artist of melting clocks.

An antique curios dealer and hybrid taxidermist.

A charming flea market shop dedicated to retrofuturistic apparati.

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

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

This surreal statue brings a famous French novel about a supernatural cad to arresting life.

Noirish green neon marks the location of one of the oldest private detective agencies in France.

This innocuous-seeming building is actually the remnant of a major wartime brothel.

The largest medical and anatomical collection in France lies hidden from the public.

Paris' fabled purveyor of exotic taxidermy and natural history curios.

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

A once-secret library of Freemason history in Catalonia.

Bask in the 19th century grandeur of an eccentric Freemason millionaire's private gardens.

An unusual stroll through gentlemen's erotica demonstrates that pornography is timeless.

Gaze upon chocolate sculptures depicting everything from chariot races to Gaudí's famous church at this shrine to sweets.

This semi-secret storybook hedge maze is also the oldest garden in the city.

An alchemist's "magic door" stands in the middle of a Roman park.

The underground sanctuary of a mysterious ancient cult.

Stone memorial that's said to predict the death of the pope and the site of the Cadaver Synod.

An ossuary built in 1210 to collect bones from the Ospedale Maggiore of Milan.