Chicago architecture, walking tour, sunny day, cloudless blue sky, Willis Tower (Sears Tower), reflective glass and steel skyscraper, Art Deco details, ornate cornices, grand staircase, historic landmark, tourists taking photos, guided tour group, headphones, maps, sunglasses, casual outfit, sneakers, backpack, city streets, urban landscape, trees lining the sidewalk, streetlights, crosswalks, 3/4 composition, low-angle shot, dramatic lighting, vivid colors.