I saw this photo of Caerlaverock Castle and it looked really beautiful.  I read here that the castle was built in Scotland in the late 13th Century and was beseiged by Edward I, who I believe was the saw Edward the Longshenks of Braveheart fame.  The castle was built in a unique triangular plan with towers on the three points and surrounded by a primary moat and a smaller secondary moat.  You can get a sense of what it must have been like back in the Middle Ages to live in and perhaps even assault such as castle.  Not an easy task, I'm sure.