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 stretches of the Great Wall did not get as much attention. In 2002 the New York-based World Monuments Fund put the Great Wall on its list of the World's 100 Most Endangered Sites. In 2003 the Chinese government began to enact laws to protect the Great Wall. In China, one of the first individuals to attempt a multi-dynastic history of the Great Wall was the 17th-century scholar Gu Yanwu. More recently, in the 1930s and 1940s, Wang Guoliang () and Shou Pengfei () produced exhaustive studies that culled extant literary records to date and mapped the courses of early border