Guerlain has long resided at this opulent address, a fitting home for Paris's first—and most famous—perfumer. Still the only Paris outlet for legendary perfumes like Shalimar and L'Heure Blue, it has added several new signature scents (including Myrrhe et Délires and Cuir Beluga). A perfume "fountain" allows for personalized bottles in several sizes to be filled on demand. Or, for a mere €30,000, a customized scent can be blended just for you. Also here are makeup, scented candles, and a spa featuring their much-adored skin-care line.