The vast ruins of this castle with an interior courtyard, the most northern in Scotland, is, with Bothwell and Dirleton, one of the largest castles from the 13C. Its defences are unusual, with a keep (of French design) and guardroom (English design). While only the foundations remain of the main buildings, including the keep and guardroom, it is easy to orientate oneself. The massive curtain wall was defended by a series of round towers, the key of which was the keep in the north-western corner. Coming from the south, you enter via the guardroom (late 13-14C) with its twin cylindrical towers, that looks very much like the one at Harlech. In the north-western corner, you can imagine the keep, a fortified position that traditionally stood just back from the entrance. To the east, you can see the gable of a mid-13C chapel.