Few views of the Strip are as breathtaking as the one you'll get from this über-chic lounge on the 23rd floor of the Mandarin Oriental at CityCenter. The room is wrapped with floor-to-ceiling windows, meaning just about every one of the plush banquettes is a winning seat. Mixologists concoct cocktails based on individual preferences, though Dom Perignon is always on hand. There's a small menu of bite-size appetizers and hip live music on weekends. Business-casual dress is recommended.