Winter, Chicago architecture tour, Willis Tower, John Hancock Center, Tribune Tower, snowflakes gently falling, frozen Lake Michigan shoreline, icy sidewalks, bundled-up tourists, warm breath misting in cold air, gloved hands holding cameras, scarves, hats, winter coats, boots, frozen fountain, City Hall, grand staircase, ornate details, Art Deco patterns, Gothic styles, Neoclassical columns, warm light spilling from windows, low-angle sunlight, foggy atmosphere, misty lens effect, cinematic composition.