David's Tower at Spynie Palace. Spynie was founded by Bishop Brice. Ratified by Pope Innocent III about 1214. Prior to this each Bishop had chosen one of the 3 churches of Birnie, Spynie or Kenedor as his episcopal seat.
Newark Castle in Port Glasgow. Built by George Maxwell in the 15th century, this elegant and still virtually intact castle was enlarged by his descendant Patrick Maxwell in the 16th century. Patrick was infamous for murdering two of his neighbours and beating his wife of 44 years who bore him 16 children. The oldest part of the castle is a tower built soon after 1478, with a gatehouse. The connecting range was added in 1597-1599 by the wicked Patrick Maxwell, in a most elegant style.
Cessford Castle entrance | Cessford Castle is a ruined L-plan castle near the village of Cessford, equidistant between the Royal Burgh of Jedburgh, and the Burghs of Kelso and Kirk Yetholm, in the historic county of Roxburghshire, now a division of the Scottish Borders. The Castle is caput of the Barony of Cessford, and the principal stronghold of the Kers/Kerrs, notorious Border Reivers, many of whom served as Wardens of the Middle March. Wikipedia