Agricultural terraces at the Pisac ruins
Pisac is in the Sacred Valley about 30km outside of Cusco. The Pisac complex is bigger than Machu Picchu and includes agricultural terraces, dwellings for Inca royalty, administrative and military buildings, tombs, and temples. Incas are famous for their agricultural terracing - they constantly experimented with different plants and different climates and reproduced their successful expirements throughout their empire. They produced an incredible amount of crops (potatoes, corn, beans, quinoa) and because of the extreme climte were able to freeze dry their food and store it for decades.