Founded by seafaring Greeks, colonized by Romans, and transformed by spoiled English aristocrats into an elegant stop on the Grand Tour, the city of Nice has beguiled travelers for two millennia. Once the winter playground for Russian royalty and an inspiration for Matisse, Isadora Duncan, and Picasso, Nice is now one of the capitals of mass tourism, overrun each summer with a motley international crowd of pleasure seekers. In High Season, acclaimed...