States southwest. Walls Construction by a box system. Used molds to pour mud without organic material, compacted. The exterior was stuccoed with sand, lime and oyster dust shells, then it was painted blue, green and pink. Without foundation; the walls were built from slots 25 cm deep. For several levels, the walls below were wider, up to 1.40 m, and 50 cm at higher levels. Furnaces and ventilation Used to control interior temperature. Ventilation was made in the doors, for smoke outflow, these were proportional to the size of the room used. Stairs and ramps Constructed in buildings. Water system "Water retention systems". An irrigation system of channels, on terraces and embankments, took water from rivers, taking it into the city. The rectangular stone slabs channels 30 cm, were used to feed rooms; had a deposit that filtered used water in Temazcal or steam baths. There was also a drain system. The Site It is one of the most characteristic Paquimé culture sites. The complex has seven rooms built inside the cave, with a huge circular barn that from afar seems to be a large dimension pot, which was used to store corn and squash. For the rooms and barn construction, cast adobe was used, depicts the typical Paquime architecture, as the "T" shaped doors. The cave is not very deep; the entrance is about three meters high. Cuexcomate This type of barns, similar to others in the highlands, for example Cacaxtla in Tlaxcala, cuexcomates are evidence of structures used for storage of agricultural products, as well as its use for food and human subsistence. Archaeological evidence exist about peoples who had agriculture and soils and water retention systems. The Cuexcomate at Cueva de la Olla is important, because of its size (2.5 m in diameter and 3.55 high), as well as by its location in the complex, for community well-being. The structure is mushroom shaped and was built with dry rolled straw. It is considered that was used to store amaranth seeds, epazote, dasylirion, guaje and others, in quantities sufficient to last 170 days. Had a red and black coating with native designs, it is thought that they invoked the protection of food and the subsistence of its approximately 30 inhabitants, which conferred it a ceremonial nature. Has a semi-circular 80 cm opening at the top, probably for ventilation, was covered with palms and carrizo; has holes on the