The largest of London's subterranean rivers and once a mad, bad center of London life.

An ancient capital city that dates back 3,000 years old and harbors many surprises.

Got apples?

France's most famous cemetery, with some of its most curious tombs.

Stroll through retro Paris while shopping for old postcards and discarded doll heads.

A haunting collection of the vanished and disappearing natural world.

An unusual number plate signifies the building's saucy past.

A grotto-like lodge decorated with gilded mosaics, rocks and a noisy waterfall was the setting for the most sumptuous pleasure house of 1900s Europe.

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

France's national museum of scientific and industrial instruments.

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

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

A museum of magic with a Sadist past.

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

Notorious artist squat renovated into legal studios.

"In the Dark" Restaurant in Paris offers dinner in complete darkness.

The celebrated eyesore created by starry-eyed sweethearts.

Walk upon the mementos of the dead in this Parisian courtyard paved with medieval tombstones.

A curious collection dedicated to human and animal anatomy and pathology.

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

The spectacular history of spectacles on display.

Museum preserving torture methods from the past.

The history and future of cannabis.

Turkish adventurer antiques in the heart of the Grand Bazaar.