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 History of the Great Wall of China The history of the Great Wall of China began when fortifications built by various states during the Spring and Autumn (771–476) and Warring States periods (475–221) were connected by the first emperor of China, Qin Shi Huang, to protect his newly founded Qin dynasty (221–206) against incursions by nomads from Inner Asia. The walls were built of rammed earth, constructed using forced labour, and by 212 ran from Gansu to the coast of southern Manchuria. Later dynasties adopted different policies towards northern frontier defense. The Han (202 – 220), the Northern Qi (550–574),