This terracing dates back to Inca times (15th century) and the circles seem to be perfect. It's 98' from the top to the bottom and a difference of 27°. The Incas took advantage of the temperature difference and were able to adapt 5 types of potatoes into 3800 varieties and 88 strains of corn to 1700 types. The plants would be planted at one level and then moved to another level where they adapted to the change. To give you a perspective of the size, there's a group of people in the upper left of center. It was quite impressive. And with the ability to grow food in more ecosystems they gained power.
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