 Its culture the way to melt the gold to obtain the exact grade of gold and copper to maintain a high purity, it is still unknown how such quality was achieved since they would need kilns that would reach a thousand degrees Celsius to melt these pieces.Another of the mysteries of the Quimbaya Culture are the Quimbaya artifacts, formerly called "Pájaros del Otún", since the former was found near the banks of the Otún River in the province of Risaralda.Engravings and petroglyphs of the Quimbayas can be found in the Natural Park of Las Piedras Marcadas, also known as La Marcada.