A traditional American farmhouse plopped in the middle of a Piccadilly courtyard.

The John Snow Memorial marks the epicenter of London's 1854 cholera epidemic.

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

The fairy tale castle of the “fairy-tale king,” this was also the inspiration for Disney’s “Sleeping Beauty.”

Enter the cabin of a life-sized Hindenburg replica.

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

A statue of the legendary Celtic warrior queen who fought the Roman invaders stands in one of the cities she once destroyed.

Once designed as the entrance to Buckingham Palace, this structure was later relocated and stands as a victory arch.

This sculpture encompasses the emotion of rail travel.

Spitalfields' regal market goat is said to be a monument to the area's migrant population but most are pretty sure it's just a goat.

Stockholm's narrowest alley is barely over two feet wide.

The official meeting point for the oddly named governing assembly of ancient Sweden.

A small church in Uppsala hides the grave of a renowned 18th-century astronomer.

This mysterious runestone embedded in a church wall is linked to the medieval cult of Saint Erik.

Ancient burial grounds of the wealthy.

A musical instrument played by the sea.

The prototype for all Nazi concentration camps.

Go surfing on this urban wave, "hacked" by local surfers.

Amidst medieval and baroque buildings, five human-sized gherkins stand tall.

Ugly 18th-century dwarf statues living in a perfectly landscaped Austrian garden.

Each year, Germany's "City of Dragons" slays the world's largest walking robot.

A quaint Russian village in the middle of a German metropolis.

Metro station with a claim to rock n' roll fame.

A monument to the three wars that led to German unification towers within a Berlin traffic circle.