This very dark, mysterious place is perhaps the most intimate bar in town. Designed by noted architect Adolf Loos in 1908, it was the drinking room of a private men's club. Today, it's more democratic and welcomes a mostly multilingual crowd from Vienna's arts-and-media scene, all crammed into about 18 square meters (190 square feet). In these cramped quarters you can't help making new acquaintances. Walls, floors, and ceilings sport layers of dark marble and black onyx, making this one of the most expensive small-scale venues in the city. No food is served, but the all-male mixologists make six kinds of martinis, and are generous with olives.