Great Wall of China: 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
Visitors walk along the Badaling section of the Great Wall of China, some 70 kilometres north of Beijing. 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 against intrusions by various nomadic groups or military incursions.
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