strasbourg, medieval bridge ponts couverts. alsace, france.

alsace alsatian architecture barrage bas bateau bridge bridges building buildings canal city cityscape colorful couverts covered dam dusk elsass europe european france heritage historical house ill landmark medieval mirror mirrored monument mouche old ouvert panorama passage patrimony petite pont ponts reflection rhin river scenic sky strasbourg straaburg timbered tourist tower town travel unesco urban vauban view water weir