This mural painted by Keith Haring was done without payment as a gift to entertain the children at the Hôpital Necker.

A museum dedicated to linguistics, from how babies learn to talk to endangered and extinct languages.

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

The Argonaute submarine was the French navy's pride and joy in the 1950's.

A short distance from the Eiffel Tower is the final resting place of several of the city’s more well-known and interesting characters.

How did a French journalist’s grave become the sexiest statue in the cemetery?

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

In the best of all possible worlds, everyone will get a chance to see this statue in which Voltaire's heart is interred.

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.

A surrealist timepiece by the artist of melting clocks.

This Parisian café sticks almost exclusively to an ethos of reuse.

A scandalous Art Nouveau collaboration that set Paris all atwitter at the turn of the century.

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

A wonderfully kitsch bookstore the size of a supermarket.

This Greek temple, open only an hour a day, was the site of a war of tastes between an architect and an artist.

One of the deepest indoor swimming pools in the world.

This modern arts center is built around a gem of late-Baroque architecture.

A fantastical 13th-century fortification sandwiched by a modern hotel in central Brussels.

A little sculpture with a large wardrobe.

The Devil’s own choice when he needs a drink in Brussels.

Lavish royal estate punctuated with heated greenhouses.

From Tintin to the Smurfs, Europe's greatest graphic icons are celebrated in a grand Art Noveau gallery.

Climb inside an iron crystal magnified 165 billion times its normal size.

Notorious artist squat renovated into legal studios.