The remains of an ancient Roman teenager are memorialized at the base of a modern London landmark.

There's an exclusive Beefeaters pub hidden in the Tower of London.

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

This artist's home turned gallery/museum preserves the creator's love of "Eastern" influences.

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

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

A student driver's nightmare.

This 1920s Dutch barge is now a floating bookstore.

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

Banksy gives themself artistic license with this piece of London street art.

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

A kaleidoscopic warehouse-maze of handmade neon signs.

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

A Baroque mansion with ties to legendary magicians and alchemists.

This automated sculpture of two men peeing will spell out text messages with their micturition.

The history of occult science is turned into a creepshow at this lurid Prague tourist attraction.

Looming communist pillar with a Czech twist.

This hidden art nouveau gem was designed by an architect in search of a national style.

A forgotten graveyard lost in the tangles of an overgrown garden.

The largest statue of this convex, homogeneous object with just one stable and one unstable equilibrium point.

A Hungarian pharmacy museum with a box full of mummy powder.

This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.

This Prague museum collects brutalist relics and memories from the country's former Soviet rule.

This spaceship sculpture in the middle of the Slovakian capital looks like it just crash-landed.