The Saint Michael fountain in the 5th arrondissement is a popular meeting point for a lot of people in Paris, due to its location just at the metro/RER Saint Michel and the big, open place in front of the fountain.
But the fountain itself is quite striking, with its pink marble columns and the verdigris of the aging bronze. I've always liked the spitting gryffins. The fountain was a part of the huge city redesign done by Haussmann during the Second Empire. It's seen a lot of fighting, though, starting with the Paris Commune in 1871 and also, during the liberation of Paris: a lot of street fighting between the fleeing Nazis and the French Résistance took place in this area due to its proximity to the Préfecture de Paris just across the bridge.