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

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

Claiming to be the oldest hat store in the world, this historic haberdashery had a hand (and a head) in the creation of the Bowler.

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

Mary Kelly was last seen here before she was murdered by Jack the Ripper.

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

The curios of pharmacist and collector Henry Wellcome.

The anatomical-pathological collection of a man who changed surgery.

Not quite the menace it once was, this monster still has some chops.

Go through the looking glass in Tokyo's Wonderland-themed shop.

The site of the most dived wreck in the UK.

A rotting air force base is now home to rare birds and scarce plants.

This ruined medieval castle was the scene of Lord Robert Dudley’s seductive reception for Queen Elizabeth I.

Preserved baths in a Victorian-era spa town frequented by the most famous people of its day.

A favorite Paris bar for U.S. expats, including Gershwin, Hemingway, and James Bond.

The very center of Paris is surrounded by a bevy of strange good luck rituals.

The largest stone circle in the world has ended up bringing up more questions than it has answered.

This hilarious English intersection is an automotive whirlpool.

Britain's answer to the NSA is based out of this deliciously-named circular headquarters.

This historic abandoned train station looks like a stop for ghost trains.

Every hour on the hour a naked heroine and her leering foil appear from this giant cuckoo clock.

World's largest Christmas store.

An abandoned set from the 1980 film "Popeye," claimed and repurposed as a theme park by creative locals.

This centuries-old tree tells an unusual tale of vegetation and fertility in the desert.