Architectural detail of Poppelsdorfer Allee, an avenue lined with chestnut trees connecting the Kurfurstliches Schloss to the Poppelsdorfer Schloss, whose grounds house the Botanischer Garten Bonn (Bonn Botanical Garden), Bonn, Germany, Europe

Castle of the prince electors, university Bonn, view from the gardens, NRW, Germany