Hadrian's Wall and the Antonine Wall are more than just walls. They are defensive structures with a series of forts along them, built when it was thought that the Roman invasion of Caledonia was costing too much. The walls contained stones with Latin inscriptions telling us who built them.
The clip could lead into more detailed study of the walls and specific archaeological sites along them. This could combine with a Geography lesson as students look at the physical features that decided why the walls were built in these locations. Hadrian's Wall and the Antonine Wall could be placed on maps by pupils and they could consider reasons for building the walls there. Pupils could investigate what is left of the walls now and how they may have looked in the past. The stones bearing inscriptions could be used to discuss the language of the Romans (Latin) and Roman numerals.