Take in a fabulous view of eastern Paris from this rooftop bar, which has been so successful it has spawned a passel of other high-altitude nightspots on top of buildings in the Marais, Buttes Chaumont, and other hip parts of the city (check website for locations). Sip a cocktail on an outdoor sofa and gaze at the Sacré-Coeur, or flirt at the tented bar; if you want to sit down, come early before the crowd arrives.