Colchester Castle is a massive stone keep and bailey fortress, built on the foundations of the Roman Temple of Claudius. Only two storeys now survive of this, the largest Norman keep ever built, rectangular in plan with huge flanking towers at the corners. In the 13th century a barbican with round flanking turrets was added to guard the forebuilding and ornate doorway. The inner bailey is still partly enclosed by a strong rampart and ditch, with the outer bailey to the north. 11 miles north-east is Little Wenham Hall.