A dark, dank room in subterranean Manhattan was the site of a ghastly murder.

The loneliest island in New York.

A band of aerialists and circus performers putting on incredible shows in East Williamsburg.

The name of this famed hospital was once a byword for the horrors of medical and psychiatric care.

Home to the infamous "Typhoid Mary" and the worst loss of life in New York's history prior to September 11, 2001.

Tucked in a nondescript downtown Brooklyn mall is a bar containing a remarkable turn of the century anatomical wax collection last seen in 1920s Berlin.

Nondescript elevator doors open to reveal a stunning, surreal world.

A hip bar decorated with walls of golden skulls.

A New York garbage depot holds a secret collection of weird and wonderful refuse.

Manhattan’s Battery Park has a whimsical carousel full of spinning, glowing fish.

A crumbling hospital from the 1850s on Roosevelt Island.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

This coffee shop lies hidden beneath a historic church.

A collection dedicated to the treatment of disease, held in London's oldest hospital.

An incarceration museum on the spot of possibly the oldest prison in England.

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

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

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

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

A kaleidoscopic warehouse-maze of handmade neon signs.

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

Next to the Leaning Tower of Pisa is a cemetery home to ancient sarcophagi and disturbing murals.

This enchanting 600-year-old tree is so magical it inspired the beloved tale of Pinocchio.

The naturally mummified body of a peasant girl saint.