Canossa Castle built
950 CE.
Shown on the map at 44.576°, 10.456°.
The Castle of Canossa is a castle in Canossa, province of Reggio Emilia, northern Italy, especially known for being the location of the Road to Canossa, the meeting of Emperor Henry IV and Pope Gregory VII during the Investiture Controversy (1077).
Text from the Wikipedia article Canossa Castle, licensed CC BY-SA 4.0.