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 For long an object of fascination for foreigners, the wall is now a revered national symbol and a popular tourist destination. The conflict between the Chinese and the nomads, from which the need for the Great Wall arose, stemmed from differences in geography. The 15" isohyet marks the extent of settled agriculture, dividing the fertile fields of China to the south and the semi-arid grasslands of Inner Asia to the north. The climates and the topography of the two regions led to distinct modes of societal development. According to the model by sinologist Karl August Wittfogel, the loess soils of