Burgh Castle was a Norman earthwork motte and bailey fortress, built within the impressive stone walls of the late 3rd century Roman 'Saxon Shore' fort of Gariannonum. The large oval motte with a surrounding ditch, was raised over the wall at the south-west corner and a rampart which once supported a timber palisade, was built on the west side where the wall is missing. Sadly the motte was leveled in the 18th century and now only fragments of the earthworks remain. 9 miles north-east is Caister Castle.