A characteristic feature of the underground city – stone wheel-doors with a hole in the middle, like a millstone. In diameter, they are usually 1-1.5 meters and weighing about 300 kilograms.
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A characteristic feature of the underground city – stone wheel-doors with a hole in the middle, like a millstone. In diameter, they are usually 1-1.5 meters and weighing about 300 kilograms.