United Nations headquarters, modern architecture, glass facade, flags waving, clear sky, urban landscape, skyscrapers background, reflective surfaces, steel structures, international landmark, daytime, bright sunlight, wide-angle shot, bustling city environment, New York City, riverfront view, East River, well-manicured lawns, peace garden, outdoor sculptures, iconic logo, visitors walking, security personnel, diplomatic vehicles, panoramic view, high-resolution image, blue hour lighting.