cross the Malpaso Valley. In order to construct this road, as well as the majority of other roads, side walls were built of stone slabs and stone; later the area in between the walls was covered with stone slabs and a pavement made of clay and pebbles. If the proportion of this element with respect to other dimensions of the site is considered, its size is remarkable. In addition, there are vestiges to two altars at the main entrance end. Recent studies confirm the existence of more than 170 kilometers of roads that cross the valley and interconnect several other smaller archaeological sites. Juego de Pelota Ballgame Court. This structure, of mesoamerican features, was constructed on an enormous platform that extends from the north of the Votive Pyramid throughout the access stairway at the south slope of the court. It measures 70 by 15 metres and it displays the characteristic letter "I" shape; the side walls are as wide as those of the Columns Hall (2.70 meters) and assumed a height of between three and five meters. As is the case in almost all archaeological sites in Mexico, this site has had vandalism. Pirámide Votiva Votive Pyramid. This structure, more than 10 metres high, is highlighted by the angle of its slopes. During Corona Nuñez works, in 1995, slope vestiges with remains of a stairway were found, that ascended the south side of the pyramid. With time the middle and top parts crumbled to the ground, where they can be seen at the present time. Originally, the stairway reached the top of the pyramid where a room or temple constructed with perishable materials apparently existed. Escalinata Stairway. At about 30 metres west of the Votive Pyramid this stairway was discovered, was used as main access to the top levels of the site. It was constructed in two stages; the first, that approximately reached the middle of the height now observed, apparently it was round shape, and can be associated with shapes of now missing structures; the second, built over the former and with greater height, it reached the walkway on the second level, evidence shows ties with a two ramp stairway that ascended to the third level. At a point in time the main stairway was cancelled, by defence reasons by means of the retaining wall, limiting access. Other platforms In the third level sector of the site, on the