View of Inveraray Castle in Strathclyde, Scotland. The construction of the castle was started in 1744 by Archibald, 3rd Duke of Argyll who wanted to create a dream fortress. An old 16th century tower house was demolished and in its place was built a grand and impressive castle. Inveraray Castle was designed by architects Roger Morris and William Adam. The castle is square in shape with corner towers and has three large central towers, each with large windows. It was built from greenish blue schist stone, which was quarried locally. The castle took many years to build and with its highly decorated interior it was not finally completed until 1770. At the same time that the castle was being built the Dukes of Argyll also rebuilt the entire village of Inveraray.