Keywords: Chicago City Hall rooftop garden.jpg Roof garden atop Chicago City Hall http //www voanews com/specialenglish/Archive/a-2002-06-27-2-1 cfm image reference http //www voanews com/specialenglish/Archive/images/ci chi il us_chicago_city_hall_rooftop_garden2_27june02_150_se jpg image source PD-USGov-VOA Chicago City Hall Gardens in Illinois Roof gardens in the United States |