Loarre Castle built
1020 CE.
Shown on the map at 42.326°, -0.612°.
The Castle of Loarre is a Romanesque Castle and Abbey located near the town of the same name, Huesca Province in the Aragon autonomous region of Spain. It is one of the oldest castles in Spain.
Text from the Wikipedia article Castle of Loarre, licensed CC BY-SA 4.0.