There are "must-sees" that everyone knows but can never see often enough:
but there are many more: "les Arums" rue du Champ de Mars, 2 rue Eugène Muller with its ceramic thistles covering the entire front, 14 place Adolphe Chérioux with an angel shielding the door with its wings...
there are doorways which are conspicuous by their shape and pictorial design; thus the door at1 place du Calvaire has owls for handles and a spider's web for its spyhole; the panels at 23bis rue Morère are decorated with flowers; the handles at 151 rue de Grenelle are lizards (one of which has unfortunately been stolen and replaced by a cheap copy);
and there are those which feature wrough iron-workt; these include the super door at rue du Louvre designed by the architect Franz Jourdain (who also worked on the Samaritaine department store), the doors of the avenue Kléber and rue Raymond Losserand notable for being shaped like peacocks' tails.
Some of these doors give access to superb entrances with their further pair of doors, their decorated walls and their mosaic floors.