The keep is the most interesting feature of the stronghold and projects slightly beyond the curtain wall near the north-east edge. The plan of the keep resembles a circle inscribed within a six sided star. The unusual shape shows how castle design evolved in response to changing methods of attack such as undermining. The six large butresses that give the keep its strength are solid apart from one that holds the chapel and staircases are built into the thickness of the towers core masonry. The entrance to the keep is on the first floor via a modern staircase.
The bailey is roughly semi-circular in shape with the keep to the north-east and the gatehouse to the south. The low remains of the other buildings can be seen along the west and north sides of the curtain wall.