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'Great Wall at Dawn' (2010) photographed by SteMurray. The Great Wall of China is one of the Seven Wonders of the World & was declared a UNESCO World heritage site in 1987. A five-year archaeological survey done by the State Administration of Cultural Heritage (SACH) found in 2012 that the total length of the Great Wall is 13,170 miles long & reaches across 15 provinces. via flickr
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 in part to protect the Chinese Empire or its prototypical states against intrusions by various nomadic groups or military incursions by various warlike peoples or forces.