The beauty of urban decay, hiding some dark secrets.

A hip bar decorated with walls of golden skulls.

Megalithic monuments resembling magic mushrooms.

A scattered trail of street art adds a pop of color to the city's stark structures.

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

At this exhibit on the world of poison, venomous animals steal the show.

Ancient man-made caves underneath small town Belgium.

Nailing a coin to this holy stump is just another way to ask the gods for relief from dental pain.

Stained glass windows bathe this botanical garden in cosmic light.

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

Repository for more than 22 million pickled specimens.

Eighty million natural history specimens call this gargantuan museum home.

A Victorian natural history and ethnographic museum with wonderful turn-of-the-century, science-book-esque evolution displays.

Remnants of a Victorian garden feature sitting in public woodland.

The curios of pharmacist and collector Henry Wellcome.

Wedged between two buildings at the Great Ormond Street Hospital is this secret music installation.

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

A kaleidoscopic warehouse-maze of handmade neon signs.

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.

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

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

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

Thriving meadows span a rooftop in one of Brooklyn's most heavily industrialized neighborhoods.