contrasting skylines of chicago and san francisco, illustrate the contrast between the historic architecture of the loop and the

chicago francisco skyline architecture contrast buildings cityscape skyscrapers urban modern historic landmarks tall structures american cities downtown metropolis waterfront river lake bay architectural styles modernism traditional marvels sprawl city lights design engineering ajestic feats area michigan pacific ocean landscape iconic skyscraper financial district transamerica pyramid willis tower cultural hubs dense development west coast midwest rich history