A pioneering exploration of four cities where East meets West and past becomes future: St. Petersburg, Shanghai, Mumbai, and Dubai. Every month, five million people move from the past to the future. Pouring into developing-world "instant cities" like Dubai and Shenzhen, these urban newcomers confront a modern world cobbled together from fragments of a West they have never seen. Do these fantastical boomtowns, where blueprints spring to life overnight on virgin land, represent the dawning of a brave new world? Or is their vaunted newness a mirage?