Kildonan Castle, Kildonan Village, Isle of Arran, Scotland is a 14th century stone rectangular tower house, founded by the MacDonalds. Built on a rocky promontory, the three storey tower is defended by steep slopes down to the beach and a northern ravine. In 1406, King Robert III granted Kildonan to John Stewart of Ardgowan and in 1544 it passed to the Hamiltons. The castle's name is derived from the name of a former resident, Saint Donan, who is said to be buried on the island.
Castle of the Teutonic Order in Malbork is the largest castle in the world by surface area, and the largest brick building in Europe. It was built in 1406 in Prussia by the Teutonic Knights, a German Roman Catholic religious order of crusaders. The castle is a classic example of a medieval fortress.