Unlike a number of the elaborate metropolis’ and statuary left behind by the Incan people the rings at Moray are relatively simple but may have actually been an ingenious series of test beds. Descending in grass-covered, terraced rings, the rings of rings vary in size with the largest ending in a depth of 30 meters (98 feet) deep and 220 meters (722 feet) wide. Studies have shown that many of the terraces contain soil that must have been imported from other parts of the region. The temperature at the top of the pits varies from that at the bottom of the ringed pits by as much as 15 degrees Celsius , creating a series of micro-climates that not coincidentally match many of the varied climate conditions among the Incan empire. It is now believed that the rings were used as a test bed to see what crops could grow where. This proto-America’s-Test-Kitchen is yet another example of the Incan ingenuity that makes them one of the most remarkable of declined societies in the planet’s history.