Chicago, architecture, walking tour, self-guided, daytime, sunny, clear blue sky, Willis Tower, reflection in glass windows, historic buildings, intricate stone carvings, ornate iron railings, Gothic Revival style, Art Deco patterns, grand entranceways, marble columns, monumental staircases, tourists, cameras, maps, sunglasses, casual walking clothes, comfortable shoes, backpacks, water bottles, street performers, live music, food carts, vendors, tree-lined sidewalks, urban atmosphere, vibrant city life, 3/4 composition, wide-angle lens, natural lighting.