cologne cityscape with embankment promenade of rhine river in deutz city district

arch architecture bank blue bridge centre city cityscape cologne construction deutschland deutz district embankment europe european famous german germany historic hohenzollern hohenzollernbrucke koln landmark landscape nordrhein north old pedestrian promenade railway rhein rheinboulevard rheinpromenade rhine river sightseeing sky steel structure tied tourism touristic town travel urban water westfalen westphalia