Chicago cityscape, architectural landmarks, sunny day, blue sky, Willis Tower, John Hancock Center, Tribune Tower, Aqua Tower, Chicago Theatre, modern skyscrapers, historic buildings, ornate details, Gothic Revival style, Art Deco elements, grand entrance, marble floors, intricate mosaics, guided tour, group of tourists, professional guide, microphone in hand, walking, pointing, excited expressions, 3/4 composition, soft natural light, warm afternoon ambiance.