Dunscaith Castle, known as the "Fortress of Shadows," is a dramatic ruined coastal fortress on the Isle of Skye originating in the 1300s as a Viking stronghold established by Gilbert MacAskill. Situated on a tidal island separated from mainland by a narrow channel once spanned by a drawbridge, the castle's architecture retains evidence of its defensive past including pivot holes in the rock. Control of Dunscaith shifted repeatedly among the MacAskills, MacDonalds, and MacLeods before its abandonment in the seventeenth century. The castle holds prominence in Scottish legend as the mythical home of the warrior-witch Scáthach, who instructed the hero Cuchulainn in warfare, making it culturally significant in both historical and mythological contexts of Highland Scotland.