A psychedelic labyrinth on the San Francisco bay.

An immersive environment that is part haunted house, part choose-your-own-adventure, and part jungle gym.

The installation’s official name, “You Who Are Getting Obliterated in the Dancing Swarm of Fireflies,” says it all.

Renaissance villa and gardens complete with a tormented colossus.

Sitting on an Italian hilltop is this surreal fortress built by the mad inventor of electrohomeopathy.

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

A special shop catering to the needs of things that go bump in the night, and also helps kids become writers.

A five-story homage to tea times past.

A comic book store that puts the marvel back in marvellous.

"Purveyors of traditional sweets and vintage treats."

Its collection includes a broad array of social, geographic, graphic design, and political history.

The ritual has been performed uninterrupted for nearly 700 years.

Drink your espresso at a Victorian-era urinal in this underground-restroom-turned-coffee-bar.

The world's oldest family-run magic shop is hidden beneath a bustling London thoroughfare.

A labyrinth hides in plain sight at each of the city's 270 Tube stations.

This long-hidden space above Westminster Abbey now displays the battle gear of the legendary King Henry V.

These official units of measurement—including chains and perches—lie hidden beneath tourists' feet in a popular London hub.

Explore nearly 400 years of English middle-class home life.

19th-century scientists would make the pilgrimage here to verify the precision of their measuring sticks.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

This small museum in a former church crypt contains artifacts of the Elephant Man, Jack the Ripper and Florence Nightingale.

The Metropolitan Police refurbished the blue box (perhaps not coincidentally) the same year "Doctor Who" returned to TV screens.

A collection of comics, graphic novels, animation and caricatures devoted to exploring this often overlooked art form.

A historic London pub with prison cells in the cellar and a "spy room" on the second floor.