The Great Wall of China is one of the most famous man-made structures in the world.
It 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 invasions and raids from various nomadic groups and military incursions.
The construction of the Great Wall began as early as the 7th century BC, with the most well-known sections built during the Ming Dynasty (1368-1644). The total length of the wall and its various branches is believed to be around 13,171 miles (21,196 kilometers), making it the longest wall in the world.
The Great Wall of China is a UNESCO World Heritage Site and a symbol of China's historical and architectural achievements. It remains an iconic landmark and a popular tourist destination.
Cartography: Cartography is the art and science of map-making, which plays a vital role in representing geographical information and aiding navigation.
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