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
Hiram Bingham III Pampa), which he named "Eromboni Pampa". However, he did not correctly recognize Vilcabamba as the last capital, instead continuing onward and misidentifying Machu Picchu as the "Lost City of the Incas", as his book titled it. Decades later, Bingham's oversight was rectified by the Andean explorer Vince Lee, whose detailed researches proved that Vilcabamba was indeed the 'last capital' of the Incas. On July 24, 1911, Melchor Arteaga led Bingham to Machu Picchu, which had been largely forgotten by everybody except the small number of people living in the immediate valley (possibly including two local missionaries named Thomas Payne and