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The Great Wall of China is a series of fortifications built to protect the northern borders of Chinese states and empires from invasion. The total length of all sections of the wall ever built is 21,196 km (13,171 miles), a process that began in the 7th century BCE and continued through the Ming dynasty (1368–1644 CE), which built the most well-preserved stone sections. Today, it is a UNESCO World Heritage Site and a major tourist attraction | ExPlore Amazing Himalaya Tours and Treks