A vast overgrown cemetery, once known as one of London's "Magnificent Seven."

Rebuilt remains of a temple to Roman god Mithras.

The curios of pharmacist and collector Henry Wellcome.

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

The only university zoological museum in London houses extinct animals, bizarre natural history specimens, and a Micrarium of microscopic creatures.

One part local history, 99 parts gruesome haunted house.

Banksy gives themself artistic license with this piece of London street art.

This London pub hides a peculiar secret: a recreation of the rooms shared at 221b Baker Street by Sherlock Holmes and Dr. Watson.

A hands-off space for graffiti artists to hone and display their skills.

An unusual round church in London with a Templar past.

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

A kaleidoscopic warehouse-maze of handmade neon signs.

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

This collection of illusory paraphernalia has been culled from the history of London's premier magician's club.

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

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

A 300-year-old tea shop that brought tea to the English people, not to mention the Queen herself.

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

Dug as a secret royal escape route, the tunnel became a wartime bomb shelter and dumping ground for vintage cars.

The Neapolitan Cult of the Dead still cares for the skulls at this mini-Fontanelle.

The burial place of an obscure North African saint was turned into a macabre body preservation factory for the 17th-century Neapolitan elite.

The once forbidden "secret cabinet" of erotic art from excavations of Pompeii and Herculaneum.

The remains of the left arm of the levitating philosopher-saint are kept in a 13th-century Neapolitan basilica.

An eerie, little-known Neapolitan museum filled with preserved human remains.