Could ancient Peruvians soften stone? Ancient Peruvian legends tell of a plant whose juices could soften any type of stone, making it malleable. According to researchers, the granite walls in Cuzco show evidence of being heated to a very high degree and vitrified; the outside surface becoming glassy and very smooth. Temperatures need to reach 1,100 degrees centigrade for vitrification and numerous archeological sites around Cuzco, including Sacsayhuaman and Qenko, showed signs of...