Marburg Castle built
1200 CE.
Shown on the map at 50.810°, 8.767°.
The Marburger Schloss (or Marburg castle), also known as Landgrafenschloss Marburg, is a castle in Marburg, Hesse, Germany, located on top of Schlossberg (287 m NAP). Built in the 11th century as a fort, it became the first residence of Landgraviate of Hesse (HRE). The Marburg Colloquy was held here in 1529. Today the building is used as a museum (Marburger Universitätsmuseum für Kulturgeschichte, Wilhelmsbau, since 1981) and as an event site.
Text from the Wikipedia article Marburger Schloss, licensed CC BY-SA 4.0.