The darkly seductive Rosebud, where the very formal waiters wear white tuxedos and sport elegant mustaches, is a throw back to the mid-20 century when Montparnasse was the center of intellectual and clubbing life. This is where Simone de Beauvoir and Jean-Paul Sartre hung out - and Parisian celebrities of various stripes still show up. People drop in here for the jazz records playing in the background, pricey classic cocktails like Sidecars and Brandy Alexanders and great chili. Hours are 7 p.m. to 2 a.m., but time is only a philosophical concept here.