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 (or, vice versa).
Address: Huairou, China, 101405
Size: 21,196 km (13,171 mi)
Designated: 1987 (11th session)
UNESCO World Heritage Site inscription: 1987
This section is currently under construction.