Of course those are kilns and I also believe those are Ming Dynasty. But I learned that kilns for bricks used in the GW are only about some meters (!) away from the GW (e.g. Gubeikou). They had even been build high up there to reduce the effort of transportation. Kilns so far away of course could have been used but maybe for other builings than the GW. If these are really GW it means that there has been good transportation infrassttructure to the Wall.
-chinoook
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The most dangerous worldview is the worldview of people, who have not viewed the world. (Alexander von Humboldt (1769-1859), German naturalist and explorer)
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