Built originally by Emperor Hadrian, the wall bearing his name is still quite an impressive sight to see. It is hard to believe this big wall was built so many years ago to at a length of nearly 80 roman miles. Also every roman mile they had a fort manned by roman guards. This wall marked the northern border of the Roman Empire in Britain and while it would be doubtful it would protect against a real full invasion it did protect against smaller skirmishes across the border. Much of the wall still exists which is impressive although much smaller than I’m sure (or hope) it was in the past. Much of the stone was likely repurposed for other uses.