Peru – Ollantaytambo Fortress Ruins

The valleys along Ollantaytambo are covered by an extensive set of agricultural terraces that permitted farming on otherwise unusable terrain; they also allowed the Incas to take advantage of the different ecological zones created by variations in altitude. Terraces at Ollantaytambo were built to a higher standard than common Inca agricultural terraces, for instance, they have higher walls made of cut stones instead of rough field stones.