Castle Hill is a medieval earth and timber ringwork fortress, which was possibly an unfinished siege-castle. Standing on the edge of a high escarpment and encased by the remains of a ditch, the partial rectangular ringwork merges with the steep southern scarp of the ridge. It is said that a keep was still visible in 1819 but this was possibly just the high remains of ramparts of heaped stone. Extensively quarried, the earthwork is confused and damaged and there is no trace of any building. Nearby is Bailey Hill.