How Did Incan Tribe Manage Sanitation at Machu Picchu?

The Inca people were a pastoral tribe in the Cusco area around the 12th century
Architecture was the most important of the Incan arts, with textiles reflecting architectural motifs. The most notable example is Machu Picchu, which was constructed by Inca engineers. The prime Inca structures were made of stone blocks that fit together so well that a knife could not be fitted through the stonework. These constructs have survived for centuries, with no use of mortar to sustain them.