Washington Dulles International Airport, modern architecture, grand entrance hall, high ceiling, natural light, glass roof, steel beams, white marble floor, minimalist design, sleek lines, bustling atmosphere, travelers walking, luggage carts moving, flight information display screens, airline logos, airport signs, security checkpoints, immigration counters, waiting areas with comfortable chairs, large windows overlooking the runway, airplanes taking off and landing, control tower in the distance, sunny day, clear blue sky.