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

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

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

This banal Parisian entranceway is not what it seems.

The narrowest street in Paris.

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

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

Walk upon the mementos of the dead in this Parisian courtyard paved with medieval tombstones.

This statue was given to France by the United States to commemorate the centennial of the French Revolution.

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

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

Paris' linguistic guide to the international language of, yes, love.

France's most famous cemetery, with some of its most curious tombs.

This pair of unsuspecting buildings are in fact the very first modern skyscrapers in Europe.

There are hidden patterns on the subway seats of some Stockholm metro cars.

A miniature model of the iconic Stockholm department store.

Maybe the only restaurant in the world where your seat will be signed by a Nobel laureate.

Hidden in plain sight, Sweden's official ordnance datum is now abandoned.

The final resting place of the man whose name has become synonymous with greatness.

This unique sculpture is often overlooked by pedestrians.

The Swedish flag over this small naval fort signals that the nation is at peace.

Sweden's oldest animated sign is still lighting up the skyline today.

This gem from the industrial age helps visitors and residents alike traverse hilly Stockholm.

A man has revenged his true love's betrayal through tears and stone genitalia.