The entire structure of the Trullo (plural Trulli) is made with local limestone, which is present in the soil of this area or which can be easily extracted from quarries situated at limited depth. In the oldest buildings stones are not squared and they are placed roughly and without any binder. In more recent ones, on the other hand, stones are squared, regular and well-arranged. The Trullo's perimeter walls are not very high. After establishing the frame, the building is covered with one layer, composed of concentric rings of stones, which are placed slightly projecting inward. Going upwards, each ring is smaller than the previous one. If the plant of the Trullo building is circular and the size of the first ring corresponds to the perimeter wall. Read more