Mil was in the habit of building "watch towers. The Milesian "tower" at Brigantia (in Carvajal on the NW Coast of Spain) is rather famous. It pre-dates the arrival of the Phoenicians, and was so ancient that when the Romans arrived they had to rebuild it.
Today's Scotland was created by a mix of Milesian Irishmen and Scandinavian Vikings. This mix is reflected quite well in "MacBeth". The King was a Scot, but his wife was the daughter of a Viking King.