Book excerpt: The world's most famous cities through the ages! Walk around any famous city and layers of history start to emerge. In London, Roman walls are dwarfed by office blocks. In Rome, ancient treasures like the Colosseum stand shoulder to shoulder with buildings from the Renaissance. In New York, skyscrapers from the 1920s and 1930s predate enormous glass towers. In Cities in Layers: Six Famous Cities Through Time, six major world cities are shown at different stages throughout history. A clever die-cut element allows readers to really peel back layers of time.