High Victorian fantasy created a fairytale castle out of a ruined fortress in Wales.

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

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.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

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

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

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

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

This churchyard arbor is surrounded by hundreds of gravestones placed there by author Thomas Hardy.

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

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

The biggest and deepest Cold War bunker open to the public can be found in southeast England.

Following the trail of an old metro line, this scenic path is haunted by a creepy spriggan statue.

This 13th century castle is chock full of ghosts and impossibly rare cows.

Fantastically decorated underground chambers built in the 1760s.

Human-made caves excavated to hide a secret society of wealthy pagans.

There are hundreds of secret WWII bases hidden in British forests. Built to fight a Nazi invasion, they remained unknown for decades.

The mysterious, fantastical woodland inspiration for "The Lord of the Rings."

St. Mary's Asylum was isolated and abandoned before being converted into a Bed and Breakfast.

A 4,500-year-old forest is slowly being revealed from beneath the sands of a Welsh beach.

The remains of centuries of copper mining appear like an alien landscape.

A museum in England’s Lake District dedicated to the trusty pencil wants you to know the story of their World War II spy pencils.

One of the largest sculpture collections in the U.K. features history's greats, from Bob Dylan to Galileo, in bronze.