Chicago architectural tours, daytime, sunny weather, clear blue sky, Willis Tower (Sears Tower), modern skyscraper, glass and steel structure, reflective windows, Chicago River, bridge, urban landscape, cityscape, riverwalk, walking tour group, professional guide, holding microphone, gesturing, enthusiastic expression, sunglasses, casual outfit, backpack, camera, map, historic buildings, ornate details, Art Deco style, Gothic Revival architecture, grand staircase, intricate carvings, ornate ceilings, marble columns, vibrant street art, urban vibes, warm natural light, 3/4 composition.