The Mysterious Moray Agricultural Terraces of the Incas.
One of the most visually stunning Inca ruins beside Machu Picchu is the Moray Agricultural Terraces. It's weird that this site is not on the typical tourist agenda, but we're glad we went. The site holds a series of concentric terraces that looks like an ancient Greek amphitheater, and it descends to a depth of approximately 150 meters. The circular bottom is so well drained that it never completely floods, no matter how plentiful the rain.
The most widely agreed theory about this site is that the Incas used it as an agricultural research station. Pollen studies indicate that soils from several region of the Andes, from tropical and sub-tropical areas, were imported by the Incas and deposited in each of the large circular basins. Seeds were then cultivated, studied, and likely sent throughout the Incan empire to improve yield in the harsh conditions of the Andes.