Galeries Lafayette.
This luxe department store goes above and beyond to give customers the royal treatment from the moment they walk in. Translators, guest lounges - Japanese tourists get their own - a deluxe grocery and even private weekly fashion shows make clear that this is no ordinary mall. But by far my most favorite luxury is the domed ceiling, a resplendant mass of gold and stained glass radiating dazzle and shimmer down to the awed patrons below.
If you can pull your eyes away long enough to shop, remember to use the 10% discount card found in most Galeries Lafayette maps (the hotels Majestic, Raphael and Regina distribute them, though you may find them elsewhere) and to get your tax refund before you leave. To reserve a place at the fashion show (it's free!), e-mail welcome@galerieslafayette.com or call +33 1 42 82 36 40. Shows are every Friday at 3pm in the Salon Opera on the 7th floor, and include a commentary in English.

