Chicago architecture, walking tour, daytime, sunny weather, clear blue sky, Willis Tower (Sears Tower), reflective glass, steel frames, urban landscape, busy streets, pedestrians, tourists, camera, sunglasses, casual wear, comfortable shoes, map, backpack, historic buildings, ornate details, Gothic style, Art Deco, modern skyscrapers, riverwalk, Lake Michigan shoreline, cityscape, vibrant atmosphere, warm lighting.