The wall in Xi'an, capital of Shaanxi Province, was built in 1370 and is the largest and best-preserved wall in the world. It stretches 13.75 kilometres around the city and is 15 metres high at the top. The wall was constructed with compressed earth and then covered by bricks.

Over time the wall's condition deteriorated, but in 1983 the local government started a rebuilding and renovation project. However, some sections were renovated with red bricks, which were not used in the original construction.

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