The Great Wall is the largest man-made project in the world with a total length of 21196.18 km, stretching from the east seaside to the west desert in northern China.
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There are 15 strategic passes from the East to the West.
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It took over 2,000 years to construct the wall.
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The Great Wall is not a single-structured wall, it includes beacon towers, barriers, barracks, garrison stations, and fortresses along the walls, together forming an integrated defense system.
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Various materials were used to build the Great Wall including bricks, cut stone blocks, tamped earth, uncut stones, and wood.
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The eastern beginning in the sea: Shanhai Pass was a fortress built in the Ming Dynasty (1368 – 1644) and is the first pass in the East of China.
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The western end in the Gobi Desert: Jiayu Pass is famous for being the first frontier fortress at the western end of the Great Wall of China in the Ming Dynasty.