What looks like a normal building is really a hollow facade hiding a subway vent.

Once a 19th-century brasserie, this McDonald's exterior celebrates Alsatian design and the "King of Beer."

This banal Parisian entranceway is not what it seems.

If you look closely at the oldest bridge in Paris, you might notice hundreds of ugly faces leering from its sides.

This oddly shaped boulder in Paris is rumored to be cursed.

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

A 16th-century fountain marks the site of a lost medieval cemetery once filled with mass graves.

A Parisian exterminator's shop whose storefront displays stuffed rats hanging from traps.

Notorious artist squat renovated into legal studios.

An unusual number plate signifies the building's saucy past.

This 18th-century sundial was designed to calculate the date of Easter each year.

A poem by Arthur Rimbaud is inscribed on the wall of a street that, while it is only one block long, plays a key role in multiple novels.

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

This stunningly massive housing complex is a go-to filming location for dystopian sci-fi cinema.

A suburban housing complex with astonishing architectural features, locally nicknamed "the Camemberts."

The largest stone moved during the Stone Age once stood proudly in France.

The legendary giant's severed hand sits on Antwerp's popular shopping street.

The Siege of Naarden ended in 1814, but the cannonballs embedded in the town church remain.

This facility has manufactured stunning tapestries for France's royalty ever since the 17th century.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

A mechanized clock where a man fights off a dragon, crab, and rooster.

This diner from 1930s America now resides in a small town in the Netherlands.

This large open-air museum showcases the ordinary lives of the people of the Netherlands and pre-industrial crafts and practices.

With a facade that measures just 107 centimeters, this five-story building is one of the skinniest in Europe.