Scots castles. Tall tower houses, embellished or with walls, additions, or not. They are in ruins in the glens, on the moors, in good condition some, and always evoke the need for a family's defense in isolated places. Put the windows high up, the entry an obstacle with the heaviest of reinforced doors, ditches outside, draws to raise.
Theory is interesting, but riveting is considering life in these structures, as a family. The husband off to warring or governing, the lady at home, the retainers, the hunting and fishing culture that meant sustenance then. Defense against marauding neighbors or invaders. England's castles look brittle and purposeful. Scotland's hold echoes of people inside.