When the dress code transforms from "smart casual" by day to "smart glamorous" by night, you know you've come to the cosmopolitan heart of Milan. The quiet hum of Radio Rooftop Bar's lunch hour builds into a crescendo as evening descends and aperitivo is served, and then cranks up the volume as a DJ rocks the night with sets of funk, house, jazz and remakes of greatest hits. Dominating the tenth floor of five-star ME Milan il Duca Hotel, Radio hovers over Piazza della Repubblica providing a breathtaking perspective of the shimmering city by-night from its outdoor terraces. That said, the spectacular view has to compete for your attention with some of the best people-watching in Milan.