The Walls of Coca Castle, Spain

From Wikipedia: Castillo de Coca:

The ground plan of the castle is rectangular, and it has a three-tiered defence system consisting of wall circuits enclosed within a moat and a central keep. The central keep is situated in the northern part of the castle and is known as the Tower of Homage. There are two curtain walls that enclose the enceinte, but the outer curtain wall is not intact. Today there are traces of the outer curtain wall, as well as a number of towers – some in ruins others standing – that mark the boundary where the outer moat circled the castle. All of the outer towers were rectangular in shape. The second curtain wall has a gate near the inner keep with a high brick arch enclosed by a geometric border, the alfiz, which is a classic Moorish design feature. The inner curtain wall has several towers and a talus as well. It has centered cylindrical towers on each side and smaller turrets between them, while the talus is constructed all the way down to the moat. 

The towers on the corners of the walls are rectangular. The surviving wall is machicolated. This coupled with the talus served as a formidable defence. The battlements on the walls have been constructed as both ornament and as defensive fortifications, so they have been built with crests that jut out from the walls. Brickwork in Mudejar has been used here as well.