Qenco
  About 2 kilometers northeast of Sacsayhuaman lie the ruins of Qenco, a word which means zig-zag, or "twisting channels."  It is an eroded limestone outcrop, all arranged to cleverly use the rock's natural shape. 
  Qenco was a shrine, and there are caves where the mummies of lesser royalty were kept in niches along with gold and precious objects.  The quarries are close by. 
  Our guide told us that a kind of "magic" liquid to dissolve solid rock was invented  by the ancient Peruvians. Could the "Fire Rods of the Gods" have been laser beam tools to cut the stone?