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.

A island reachable by a causeway at low tide is possibly one of the earliest Western European locations to be identified in text.

Tiny effigies of the victims of Edinburgh's famous Anatomy Murders.

A subterranean ice warehouse that has lain hidden beneath central London for over a century is now open to the public.

A 200-year-old prison that now houses a peculiar crime museum.

Below a historic English market town lies a secret underground city complete with kitchens, laundries, storerooms, and an underground lake.

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

Surreal riveted sea forts once protected the Kent shores from German attack.

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

The world's largest collection of witchcraft regalia.

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

The sign at the garden gate reads: "These Plants Can Kill."

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

The signs of a long buried road can still be found hidden beneath a London sewer grate.

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

Since 1874, this macabre collection has developed into a museum devoted to Scotland Yard's mementos of dastardly deeds.