Nature

Day 4 : de 08:40 to 18:40 (local time)

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.

Several walls were being built as early as the 7th century BCE

Archaeological survey found that the entire wall with all of its branches measure out to be 21,196 km (13,171 mi).
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Last update on Monday, November 28, 2016 at 4:35:05 AM GMT+1 - Alert on the content of this stage