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
Lost City of the Kalahari Lost City of the Kalahari The Lost City of the Kalahari is a historical mystery of exploration and archaeology dating to the end of the 19th century. The history reports the existence of a ruined city found in the Kalahari Desert in southern Africa. In 1885, the Canadian Guillermo Farini (pseudonym of William Leonard Hunt) was one of the first westerners to cross the unexplored portion of the Kalahari. On his return to Europe, he published a book detailing his experiences which included descriptions of unusual rock formations which he believed to be ruins of hitherto unknown buildings. Farini subsequently