Great Wall of China the optics much better, rendering photographic evidence irrelevant to the issue of whether it is visible to the naked eye. Great Wall of China The Great Wall of China is a series of fortifications made of stone, brick, tamped earth, wood, and other materials, generally built along an east-to-west line across the historical northern borders of China to protect the Chinese states and empires against the raids and invasions of the various nomadic groups of the Eurasian Steppe with an eye to expansion. Several walls were being built as early as the 7th century BC; these, later joined together and
History of the Great Wall of China 30,000 settler families to colonize the newly conquered territories. Wall configurations were changed to reflect the new borders under the Qin. General Meng Tian erected walls beyond the northern loop of the Yellow River, effectively linking the border walls of Qin, Zhao, and Yan. Concurrent to the building of the frontier wall was the destruction of the walls within China that used to divide one warring state from another—contrary to the outer walls, which were built to stabilize the newly united China, the inner walls threatened the unity of the empire. In the following year, 214BC, Qin Shi Huang ordered