The longest hedge maze in the world.

Several plaster noses are hidden in plain sight around London's Soho neighborhood.

The curios of pharmacist and collector Henry Wellcome.

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

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

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

A tongue-in-cheek arcade where the games are based on everyday life.

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

The hidden "ballroom" under a mansion lake was built by a criminal who ate a cyanide pill during his trial.

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

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

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

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

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

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

Each year a new straw behemoth is born.

The sculpture is made of more than 100,000 knives collected to raise awareness about violence.

Mysteriously stacked storefront paths give this medieval British town an iconic style like none other.

This 1776 beacon on the coast of Wales is said to have a ghost called Raymond, the last lighthouse keeper.

During this yearly Welsh swimming race, competitors tread through the fetid waters of a bog trench.

One of the few surviving street funiculars in the world.

A 19th-century funicular railway shuttles visitors up this surprising sea cliff to one of the world's largest camera obscuras.

Recently restored menagerie of Victorian-era beasts.

The enormous earthwork sculpture honors the ponies that lived and worked in the old colliery.