Downtown South, Chicago's south side, is populated by a forest of skyscrapers and museums with exceptional scope, such as the Art Institute of Chicago and the Field Museum of Natural History. Start by exploring Millennium Park, umissable and unforgettable, with its sculptures, buildings and spectacular views over the city. Continue by taking the aboveground "L" train, which treats you to impressive views that you won't otherwise see of the streets, which form so many urban canyons dedicated to finance.