The longest and one of the greatest walls built in history - Great Wall Of China, built to defend the inland of China from the Mongols.Stretches out across China, length over 5000 miles, passing over 50 strongholds at the time, defending more than 50 cities at once. The idea of building the wall was brought up during the Spring-Autumn Warring Kingdom, however, the wall was in pieces until the Qin Dynasty, after Qin Shi Huang united China, he also joined up the walls in order to defend the peaceful inland of China from the Mongols. As they are building the wall, Qin also considered a very acute fact- if the invaders focus on one part of the Great Wall - due to that, they built the beacon towers on top of the wall. Beacon towers on the wall is
