Generally , these are referred to as city walls or town walls , although there were also walls , such as the Great Wall of China , Walls of Benin , Hadrian 's Wall , and the metaphorical Atlantic Wall , which extended far beyond the borders of a city and were used to enclose regions or mark territorial boundaries .
Generally , these are referred to as city walls or town walls , although there were also walls , such as the Great Wall of China , Hadrian 's Wall , and the metaphorical Atlantic Wall , which extended far beyond the borders of a city and were used to enclose regions or mark territorial boundaries .