koblenz, germany - 09 12 2022: flood walls with a gate in the tunnel

bridge arch architecture transport waterway infrastructure landmark wall estate building road facade overpass ruins viaduct walkway monastery koblenz germany 2022: flood walls gate bridges regional center rhine mosel old town located rivers called rhein-mosel-stadt touristic context marks north mittelrheintal unesco world heritage site deutsches eck estuary ship shaped front holding german states flags statue kaiser wilhelm horse reunification monument wiedervereinigung 1990 festung ehrenbreitstein east side tunnel