© Sebastien LAPEYRERE ; Machu Picchu ( Peru) November, 23rd 2015; Machu Picchu archaeological site . The ruins of the Inca citadel of 15th century stands at 2340 m altitude on a narrow rocky ridge above the Urubamba River. Composed of administrative , political and religious center dominated at agricultural terraces, astronomy observatory, temples and religious buildings, industrial workshops she would was built by the Inca king Pachacútec. Way of the Inca that leads to the door of the sun " Intipunku"