Saksaywaman lies in the northern outskirts of the city of Cusco in Peru. It is famed for its terraces of large dry stone walls which have boulders intricately cut to fit together tightly without mortar. The architectural wonder is that the stones are so closely spaced that a single piece of paper will not fit between many of the stones. Also there is a variety of interlocking shapes, and the way the walls lean inward have puzzled scientists for decades. Various theories put forward include: stone softening using liquid derived from a plant, heat from large sun mirrors, extra-terrestrial intervention and the use of pounders.
Saksaywaman
