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.
Not really that uncommon everywhere. The old ruins are a great source of building material all over the world.
Coliseum in Rome is the biggest example.
Why not. Recycle!!!