The television series' iconic giant foot was borrowed from this classical painting.

The largest of London's subterranean rivers and once a mad, bad center of London life.

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

Hidden beneath the streets of London is a secret subway that only carried mail.

The celebrated eyesore created by starry-eyed sweethearts.

A series of abstract, silly sculptures represent the works of a great modern classical composer.

An all-American grocery store in Paris sells U.S. "cuisine" like Pop-Tarts and Heinz ketchup to homesick ex-pats.

An overlooked marble is the only surviving in-place 18th century example of the measurement that changed how we define distance.

France's national museum of scientific and industrial instruments.

A museum of magic with a Sadist past.

Each time a baby is born in Ghent, these streetlights flash in silent celebration.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

A flourishing garden with pigs, donkeys, goats, rabbits, guinea pigs, chickens, ducks, and sheep.

A community of artists and entrepreneurs seeks a simpler life on London's waterways.

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

Twelve grave-faced marble angels guard the emperor's tomb at Les Invalides.

This bridge was constructed from the rubble of the infamous Bastille.

Fittingly, America's museum of architecture is itself a magnificently designed old building.

A singular collection of hand-built art deco cars are held in a building with style to match.

The farm where one of America's greatest leaders was raised is now a well-appointed landmark.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

Where commuters walk through remnants of an ancient Greek necropolis.

The famous winding walk at Chartres is surrounded in mystery and myth.

This unusual piece of Renaissance art depicting the bodily horror of crucifixion and skin disease may have been inspired by fungus-induced hallucinations.