Part 6/9:
During the Ming Dynasty, a significant reconstruction phase between the 15th and 17th centuries saw the expansion of the Wall to formidable lengths. In an astounding feat, builders managed to erect over 8,500 kilometers of wall within just 70 years under immense pressure from Mongolian incursions. They utilized gigantic bricks—up to four times larger than ordinary bricks—allowing for rapid construction without sacrificing strength.
To find the clay essential for their brick production, Ming builders cleverly targeted local geology, extracting materials directly from the landscape surrounding the Wall. Analysis reveals that nearly 75% of the brick composition comprises clay, while the construction process involved advanced baking techniques that produced exceptionally durable bricks.