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The First Fire Tower of the Great Wall 嘉峪关

7 kilometers south of  Jiayuguan(嘉峪关Jiāyùguān) City lies the Great Wall’s first  fire tower(烽火台Fēnghuŏtái), regarded by some as the world’s first frustum(a truncated cone or pyramid; the part that is left when a cone or pyramid is cut by a plane parallel to the base and the apical part is removed), or cut-off pyramid(a polyhedron having a polygonal base and triangular sides with a common vertex). This structure marks the western beginning of the Ming Great Wall.

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