An architectural oddity hides in plain sight on this iconic London bridge.

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

Ship-sized kinetic sculptural fantasy.

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

A little slice of Japan and its aesthetics in London's Holland Park.

A statue marks the exact spot where The Boy Who Never Grows Up made his first literary appearance.

Giant, friendly pelicans in Central London, the most unlikely of places.

A hands-off space for graffiti artists to hone and display their skills.

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

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

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

Once one of the largest rooms full of books in the world, this bookstore basement is still a treat for bibliophiles.

Local legend says Isaac Newton built this footbridge without any screws, bolts, or nails.

Numberless clock creates a meal of time for the dreaded, insectile Chronophage.

A medieval wash house where people washed clothes in a river allegedly formed by the tears of a mourning nymph.

A collection of grotesques lines the walls of this Italian villa.

The walls and streets of the ancient city are peppered with penises.

A volcanic old faithful, Stromboli has been erupting continuously for the last 2000 years.

This Italian foot path winds through the mountains via 52 individual tunnels.

Pilgrimage site for star-crossed lovers.

One of a series of no-purpose kinetic artworks by Swiss sculptor Jean Tinguely.

Two very green residential towers cleaning the air in one of Europe's most polluted cities.

A quirky bookstore hidden beneath a sea of whitewashed Greek villas.

Nearly every wall in this French villa has been "tattooed" by artist Jean Cocteau and other famous painters.