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
Machu Picchu center. Owned by the National University of San Antonio Abad del Cusco, La Casa Concha also features a study area for local and foreign students. The Paramount Pictures film "Secret of the Incas" (1955), with Charlton Heston and Ima Sumac, was filmed on location at Cusco and Machu Picchu, the first time that a major Hollywood studio filmed on site. Five hundred indigenous people were hired as extras in the film. The opening sequence of the film "Aguirre, the Wrath of God" (1972) was shot in the Machu Picchu area and on the stone stairway of Huayna Picchu. Machu Picchu