Just on a single hillside, he found nine adjacent walls, connected in a rampart system. At the moment, it’s unclear who built them. However, the wall may have not been used only for defense.

The Wall stretched from West Kilpatrick on the Clyde to Carriden on the Forth. It took the 6th and 20th legions, with auxiliary troops, only two years to construct its 36 miles of rampart ...