Introduction Historical context The natural setting About the disoccupation when discovered Description of Machu Picchu Wayna Picchu and the temple of the moon Reconstructing the past The productive activities The population and the labor force Construction Engineering Agricultural technology Manufactured production The productive activities Construction Engineering ---------Select---------Sources of raw materials: quarries-------------------------Techniques andbuilding types-------------------------Construction of roads and bridges It is necessary to point out that Inca constructions are characterized by adapting their forms to the conditions of the terrain on which they are built. They reserved naturally flat soils for fields for cultivation and moved construction for housing and other types of building to pieces of land on hillsides. Therefore, when they lacked flat pieces of land - as is characteristic in most of the territory of the cordillera - they provided them in the form of terraces, and artificially produced efficient fields for cultivation and housing. Machu Picchu is not, then, an exceptional case. For this reason, this site like most Inca settlements is built on terraces and appears stepped, with its paths and communication networks turned into flights of steps.