Machu Picchu National Geographic again and with the full support of Peruvian President Leguia. The expedition undertook a four-month clearing of the site with local labour, which was expedited with the support of the Prefect of Cuzco. Excavation started in 1912 with further excavation undertaken in 1914 and 1915. Bingham focused on Machu Picchu because of its fine Inca stonework and well-preserved nature, which had lain undisturbed since the site was abandoned. None of Bingham's several hypotheses explaining the site held up. During his studies, he carried various artifacts back to Yale. One prominent artifact was a set of 15th-century, ceremonial Incan
Inca Trail to Machu Picchu and ceremonial functions, crop production, and housing for soldiers from the nearby hilltop site of Willkaraqay, an ancient pre-Inca site first inhabited around 500 BC. The trail undulates, but overall ascends along the Kusichaka River. At the small village Wayllapampa ("grassy plain", "Wayllabamba") the trail intersects with the "Mollepata Trail" at . Small, permanent settlements are located adjacent to the trail, and Wayllapampa has approximately 400 inhabitants (130 families) spread along this portion of the trail. Pack animals—horses, mules, donkeys, and llamas—are allowed. At Wayllapampa the trail to Machu Picchu turns west and begins ascending along a tributary of the