 Nothing of Petriana has survived, the largest visible remains in Cumbria now belong to the fort at Birdoswald – very little of the Wall itself can be seen in Cumbria.Running to the north of the Wall was a ditch, and to the south an earthwork (the Vallum).Initially, forts were maintained on the Stanegate line, but in around 124 AD – 125 AD the decision was taken to build forts on the Wall itself, and the Stanegate ones were closed down.