JS Audio has most of the big audiophile brands--e.g., Wilson, Revel, Meridian, McIntosh-- and enough rooms to demonstrate the gear. This would be the best, single, conventional store.
Evolution Audio, near Tysons Corner, has brands such as Magico, VTL and Audio Research. Although it is just off a main road, it helps to have GPS because it is a bit hidden.
The most unusual store, and the most friendly and interesting, is Deja Vu Audio. This store sells mostly tube gear, particularly very old vintage gear and their own exclusive lines of "new" gear made from vintage parts, and custom-designed and built speakers using very old drivers. A lot of people will completely NOT get what this sound is about, but, for a number of newcomers, the place delivers an almost religious-conversion experience.
