“Hadrian's Wall was 80 Roman miles or 117.5 km (73.0 mi) long; its width and height were dependent on the construction materials that were available nearby. East of the River Irthing, the wall was made from squared stone and measured 3 metres (9.8 feet) wide and 5 to 6 metres (16 to 20 feet) high, while west of the river the wall was made from turf and measured 6 metres (20 feet) wide and 3.5 metres (11 feet) high. The initial plan called for a ditch and wall with 80 small gated milecastle fortlets, one placed every Roman mile, holding a few dozen troops each, and pairs of evenly spaced intermediate turrets used for observation and signalling. However, very few milecastles are actually situated at exact Roman mile divisions; they can be up to 200 yards east or west because of landscape features or to improve signalling to the Stanegate forts to the south.” The milecastles and turrets were of three different designs, depending on which Roman legion built them – inscriptions of the Second, Sixth, and Twentieth Legions, show that all were involved in the construction. All were about 493 metres (539 yards) apart and measured 14.02 square metres (150.91 square feet) internally.("Hadrian's Wall." Wikipedia. Wikimedia Foundation, 11 Oct. 2014. Web. 09 Nov. 2014.) Here is a map of the wall running across England (Contours).

To the south of the Wall are a road, the Military Way, and another ditch, flanked by banks called the Vallum. The Vallum was built after the Wall and was an earthwork construction running the length of the frontier from the Tyne to the Solway. It defined the rear of the military zone, controlling movement of people into the military area. This can be seen in the picture below. Once its construction was finished, it is thought to have been covered in plaster and then white-washed, its shining surface able to reflect the sunlight and be visible for miles around. (Wikipedia)