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Photo: Holger Weinandt, CC BY-SA 3.0 via Wikimedia Commons
The Marksburg is a castle above the town of Braubach in Rhineland-Palatinate, Germany. It is one of the principal sites of the Rhine Gorge UNESCO World Heritage Site. The fortress was used for protection rather than as a residence for royal families. It has a striking example of a bergfried designed as a butter-churn tower. Of the 40 hill castles between Bingen am Rhein and Koblenz the Marksburg was one of only two which was never destroyed, and the only one that never fell into disrepair.
© OpenStreetMap contributors
Schloss Stolzenfels
Stadion Oberwerth
Football Stadium.
Electoral Palace
This is a nice little fountain near the town hall. You should stand three steps in front of the fountain and in front of the figure's face. Wait there three minutes. What then happens should bring fortune.
This is a big military castle/fort in good condition. From there you have a good view over Koblenz. There is also one of the museum of Koblenz. It is located on the other side of the Rhine.
This spot (the name means German Corner in German) is where the Mosel River meets the Rhine River. The tip of the park is shaped like a ship's prow, overlooked by an enormous equestrian statue of Kaiser Wilhelm mounted on an equally-huge stone base that you can climb for a great view of the rivers and opposite shore castle/fort. Not far from the German Corner, you can catch a little sightseeing train which will drive around & point out some of the interesting things about Koblenz.