Hadrian's Wall was not all built to the planned 3 metre width, perhaps to save time and resources. However, here at Heddon you can see the "broad" Wall, over 100 metres long. Some of the massive foundation stones weigh over a tonne each. At the west end a medieval circular kiln has been built into the wall.
See my photos of Hadrian's Wall In Newcastle and Wallsend.
Hadrian's Wall Camera - Benwell to Heddon - Milecastles 7 to 12