we continue on a short distance to the Moray ruins. The ruins are composed of three coliseums, which are thought to have been used by the Incas as a sort of open air crop laboratory. The coliseums consist of several enormous terraced circular depressions, the largest of which is about 30m/98ft deep. The purpose of these depressions is still uncertain but their depth and orientation with respect to wind and sun creates a temperature difference of as much as 15 °C/27 °F between the top and bottom.