The Great Wall长城Construction of the Great Wall began during the Spring and Autumn Period to the Warring States Period. Several vassal states built wall fortifications successively along the precipitous mountain ridges to ward off the plunder of nomadic people and the invasion of each other. In 221 B. C. when Qin Shihuang united China, he ordered to link the walls up. During the following dynasties, the Great Wall was destroyed continuously by natural disasters and human beings.Among the remaining broken pieces of walls, those constructed in the Ming Dynasty are the most well-preserved and splendid ones. The Great Wall stretches some 6,300km from Jiayuguan Pass in the west to the Yalujiang River in the east, traversing 11 provinces, municipalities and autonomous regions. Not only is it the most magnificent ancient military defense work, but one of the most remarkable ancient buildings in the world.长城始建于春秋战国时期。各诸侯国为相互防卫和抵挡北方游牧部落的袭扰，在地形险峻之处陆续兴筑长城。公元前221年，秦始皇统一中国后，将从前的长城连接起来。
在以后的几个历史时期，由于大自然和人为因素的破坏，留存到今天的大都已是断断续续的遗迹。而在这些遗迹中留存最原始、最套宜、最壮丽的是明代长城。长城绵延中国的11个省、市、自治区，西起嘉峪关，东到鸭绿江，全长约12600华里。
它不仅是古代最壮丽的军事防卫工程，也是世界上最非凡最最出色的古老建筑之一。
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