5. The Wall of Western Sahara

Abstract

All military walls in history were originally built with a protective function to keep out invaders. China’s Great Wall, the most famous and the longest manmade structure in the world, was built for defensive and protective purposes, to safeguard and unify the Chinese territory and empire. Also, in ancient civilizations, the high walls surrounding old cities were constructed as fortifications to defend the people from potential aggressors. However, modern international walls and fences are di..