Dry stone from the arable or cultural land. They serve both as cattle/sheep fences and the lot's borders. Sometimes also the dry stone terracing is apparent, often combined with parts of stone masonry (house foundations and shed walls) that are held together by a clay-cum-needles "composite" mortar. In Peru in the 15th century AD, the Inca made use of otherwise unusable slopes by building dry stone walls to create terraces. They also employed this mode of construction for freestanding walls. Their ashlar type construction in Machu Picchu uses the classic Inca architectural style of polished dry-stone walls of regular shape. The Incas
Intihuatana, Urubamba Intihuatana, Urubamba Intihuatana (possibly from in the Quechua spelling "Inti Watana" or "Intiwatana") at the archaeological site of Machu Picchu (Machu Pikchu) is a notable ritual stone associated with the astronomic clock or calendar of the Inca in South America. Machu Picchu was thought to have been built c. 1450 by the Sapa Inca Pachacuti as a country estate, althought it is equally likely that the Inca discovered much older ruins (the inti watana, the temple of the sun, and the temple of the condor) and opted to build this majestic estate on older foundations. . In the late 16th