Shakespeare, David Bowie, Dr. Who, the Saxons, Druids and Romans are all claimed to have all made their mark on these massive man made tunnels.

Winding paths and ramshackle mausoleums in the oldest "park cemetery" in London.

A student driver's nightmare.

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

The world's first underground farm is in a World War II bomb shelter beneath the streets of London.

Floating pink tap installed for a flower show in London.

A historic house left in "dramatic still life."

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

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

This South London cemetery holds the remains of more than 15,000 people.

Bronze sculpture celebrating the relationship between Churchill and Roosevelt.

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

London's smallest police station is barely the size of a phone booth.

Hidden beneath the streets of London is a secret subway that only carried mail.

Over 3km of caverns and caves at the Switzerland-France border contain the largest underground river in Central Europe.

A charming flea market shop dedicated to retrofuturistic apparati.

Skeletons, medical artifacts, and other obscure and precious treasures all displayed in a wooden pharmacist's cabinet.

An antique curios dealer and hybrid taxidermist.

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

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.

Indents in the pavement are all that remain from a grisly death machine in Paris.

A Parisian exterminator's shop whose storefront displays stuffed rats hanging from traps.

Notorious artist squat renovated into legal studios.

Weird wax anatomical models reside here, as do other anatomical specimens.