When the first-time visitor arrives at the base of the Ollantaytambo terraces, the structures which capture the eye are not on Cerro Bandolista; they are across the valley on Cerro Pinkuylluna.
Inca Storehouses on Cerro Pinkuylluna
Perched on the steep slopes of the hillside, these buildings were the Inca’s personal storehouses for the produce of his estate.
Cerro Pinkuylluna as seen from Cerro Bandolista with the village of Ollantaytambo in between
The hillside is littered with the ruins of these storehouses, many of them in seemingly inaccessible locations.
The most visible ruins are of three identical, but separate buildings. Each had six tall windows on the downhill side, ten on the uphill side, and a doorway and a window in each gable end. The rear section of each floor was raised, and there were covered drains or ventilation channels carved into the raised sections.
Protzen conducted some experiments on airflow using a scale model of these buildings in a wind tunnel. He found that the closeness of the buildings with their high-pitched roofs created negative pressure zones between the roofs and at the back of the uphill building making the buildings quite aerodynamic. Ventilation even improved when the buildings were filled.
For details, see Jean-Pierre Protzen, Inca Architecture and Construction at Ollantaytambo, Oxford University Press, 1993.