The Moorish fortress sits at the top of the old village and is free to enter. Much of the defensive walling survives, and the interior has been partly excavated. The views from the top are the main payoff: the Guadalhorce valley spread below, the white village dropping away in terraces, and the Sierra de Málaga in the distance.
The climb from the main square is fifteen to twenty minutes on foot through the old streets. Take the path that winds up rather than trying to drive — parking near the top is limited and the lanes are narrow. In summer, go in the morning or late afternoon to avoid the heat.