Built to protect trade routes as well as property, the Great Wall of China stretches over 13,171 miles (21,196km) and is more than 2,300 years old. Over the course of the project, it is estimated that millions of people helped to build the wall, with possibly as many as 400,000 dying during construction. There is debate over the cost of completing the Great Wall, but it ranges from $95 billion to a higher estimate of $360 billion.
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