allner, germany - 08 19 2020: tower at the city walls with a door carrying an electricity infrastructure warning sign

landscape terrain nature vacation bonn 1950s flood prevention fresh siegburg main valley habitat small rivers direct connected sieg rhin nearby used side germany 2020 late summer view building tower calm cloud reflections level house information close leveling like watersupply allner hennef city limits sign next town lcated allnersee schloss old castle inhabited open public road 2020: walls door doorying electricity infrastructure warning carrying