A circular tower with a chamfered flat-arched doorway on the east side, and three slit-light windows at various levels on north-west, south and south-east sectors, illuminating the internal Newel stone staircase. At the crown there is a string course, above which the walls have a marked batter into the flat top. On the east face above the string is a cantilevered platform with a doorway at head of stairs, and an external stair to the flat top, without any surviving guard rails. The hill was the site of a Norman Castle, mostly demolished to build the Priory of Montacute. St Michael's Chapel, first recorded 1102, survived at least until the mid-seventeenth century and its site is now occupied by the tower, which was used as a signal tower to Swayne Harbin at Newton Surmaville.