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The Governor's Palace, a long low building atop a huge platform, with the longest façades in Pre-Columbian Mesoamerica. From a small platform with a stone throne with two jaguar heads, this edifice would have been used as an astronomical observatory for watching settings of Venus (similarly to the so-called "E-Group" of Uaxactun for watching solstices and equinoxes). On this same alignment (approximate azimuth 118°) and at a distance of about 5 km, observations to the western horizon from the pyramid of Cehtzuc would have seen Venus setting at its northern extreme, over the north side of the "Palace", every 8 years.