Carisbrooke Castle built
1100 CE.
Shown on the map at 50.688°, -1.314°.
Carisbrooke Castle is a historic motte-and-bailey castle located above, and to the south of, Carisbrooke village centre, on the Isle of Wight, England. Charles I was imprisoned at the castle in the months prior to his trial.
Text from the Wikipedia article Carisbrooke Castle, licensed CC BY-SA 4.0.