medieval rheintorturm in konstanz, baden-wuerttemberg, germany

architecture baden baden-wuerttemberg banks blue boats bodensee border building city constance dock end entrance europe evening flows fortification freshwater gate gatehouse german germany harbour historic history imperial konstanz lake landmark landscape light lighthouse little marks medieval nature navigation northern old rhine river sailboats sailing sea sky solid south southern suabian summer sun sunlight swabian switzerland tower town wall water west western where wuerttemberg