Vallum (Hadrian's Wall)
…consisting from north to south of mound, berm, ditch, marginal mound, berm, mound) was thus about 36 metres (100 ft). In several places (for example at Heddon-on-the-Wall and Limestone Corner) the Vallum was cut through solid rock, sometimes for lengthy distances. The distance of the Vallum from the Wall varies. In general…