Castles in Medieval Europe had a variety of main features. Castles were always built on high grounds and were used for protection. Castles were first made from wood, but soon changed to stone. Stone not only protected them when in battle but was endurable. The main features on castles in medieval europe included strong round turrets, high walls, a keep, a curtain wall, arrow slits, defensive features such as a moat, stockade, guardhouse and a draw bridge. Castles in medieval europe had several main features all in which were very important in order to survive when in battle.