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Photo: Traveler100, CC BY-SA 3.0 via Wikimedia Commons
12th century castle with expensive but impressive restaurant and hotel.
The Schönburg is a castle above the medieval town of Oberwesel in the UNESCO World Heritage Site of the Upper Middle Rhine Valley, Rhineland-Palatinate, Germany.
© OpenStreetMap contributors
Oberwesel Stadtmauer
Excellent example of town wall with many defensive towers