The Great Wall of China is one of the most iconic structures in the world, steeped in history and engineering marvels. Here are some interesting facts about it:
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The Great Wall of China is the longest wall ever built, stretching over 13,171 miles (21,196 kilometers)
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It isn't one continuous structure but a series of walls and fortifications built by various dynasties, primarily the Qin and Ming (1368–1644 CE)
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Construction began in 3rd century BCE, but most of existing wall dates to the Ming Dynasty. Different sections were built, repaired, and expanded over 2,000 years
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It was originally built to protect the Chinese Empire from invading armies, particularly the Mongols and other nomadic tribes
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Contrary to popular myth, the Great Wall is not visible from space, despite its massive length. It's barely visible from low Earth orbit
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Millions of workers, including soldiers and prisoners, laboured on the wall. Many died during construction, earning it the nickname "the longest cemetery in the world"
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The wall's materials varied by region-- stone and brick in mountainous areas, tamped earth and wood in plains, and even sticky rice was used in mortar
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The wall featured thousands of watchtowers, garrisons, and beacon towers. Smoke signals, fire were used to communicate threats, with different patterns indicating size of enemy forces
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Beyond its military role, the Great Wall is a symbol of Chinese ingenuity and unity. It's a UNESCO World Heritage Site and one of the New Seven Wonders of the World