koblenz, germany - 08 06 2024: fortress structures at the shore of ehrenbreitstein and astersein

town landmark tourism building village estate monastery tower castle palace city tree neighbourhood vacation koblenz germany 2024 rhine shore area old marks north unesco world heritage site mittelrheintal lively long history tourist spot summer passenger ships arriving bridge traffic lifelines fortress structures ehrenbreitstein astersein valley middle rhein river beautiful europe travel destination weltkulturerbe confluentes coblenz rheinburg