A retail shop has preserved the 17th-century food cellar from the old building it now occupies.

For decades, Puerta del Sol has been illuminated by a giant, guitar-wielding bottle of sherry.

A public urinal so pretty, it was declared a national monument.

A set of seven houses, each built in a style that represents a European country.

The world's largest bicycle shelter can hold more than 12,500 two-wheelers.

This hidden Art Nouveau courtyard is an opulent feast for the eyes.

Romans decided this 16th-century "talking statue" was so ugly, they named it after a primate.

This hydrochronometer was invented by a Dominican monk and is a prime feature in this garden.

A monumental fountain in Rome features a large statue of Moses that has been criticized for centuries.

This demon atop the Notre-Dame de Paris looks utterly bored.

The celebrated eyesore created by starry-eyed sweethearts.

The video game-themed street art first popped up in the French city.

The narrowest street in Paris.

Site of a classic 19th-century physics experiment to prove the earth is rotating.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

An ultra-modern diversity park in Denmark has turned an entire city block electric pink.

A mysterious shape catches the eye in this 16th-century painting.

Stockholm's tiniest statue is of a small boy looking at the Moon.

An ancient Viking runestone hidden in plain view in Stockholm's old town.

It is said that each of the white stones in the red facade of this medieval house represents the head of a murdered Swedish noble.