Not even that, really. The place I saw was about an 18” tall stack of rubble. It’s really supposed to be a “line in the sand”. Actually, I heard that it wasn’t to keep the Romans in, but to keep the Scots out, symbolically. The Romans wanted no part of them!
When you are there check out the local buildings. Most of the stone work was taken from the wall. At one site a three story
Inn/Pub about 1/2 mile away was built 150 years ago using the stone work. Most of the farm buildings and houses the same way all along the wall.