iron bridge d. luiz in oporto, portugal

ancient arch architectural architecture bw beautiful black blackandwhite bridge centennial cloudy colorful commuting connectivity construction crossing daylight decks destinations douro eiffel engineering exlibris grey heritage historic infrastructure intricate iron landmark landmarks marvel metallic milestone mono monochromatic monochrome old oporto portugal portuguese river rolmat scenic seyrig stable structural structure sturdy sunny topdeck tourism traffic transportation travel traveling unesco upperdeck vibrant vivid