The exterior of the third and highest range was plain; that of the two other ranges had been elaborately ornamented; and, in order to give some idea of their character, I present opposite a portion of the facade of the second range. Among designs common in other places is the figure of a man supporting himself on his hands, with his legs expanded in a curious rather than delicate attitude, of which a small portion appears on the right of the engraving; and again we have the "large and very well constructed buildings of lime and stone" which Bernal Dias saw at Campeachy, "with figures of _serpents_ and of idols painted on the walls." [Engraving 4: Ground Plan of the Casa Grande] The following engraving represents the ground plan of the three ranges, and gives the dimensions of the terraces. The platforms are wider in front than in the rear; the apartments vary from twenty-three to ten feet, and the north side of the second range has a curious and unaccountable feature. It is called the Casa Cerrada, or closed house, having ten doorways, all of which are blocked up inside with stone and mortar. Like the well at Xcoch, it had a mysterious reputation in the village of Nohcacab, and all believed that it contained hidden treasure. Indeed, so strong was this belief, that the alcalde Segundo, who had never visited these ruins, resolved to take advantage of our presence; and, according to agreement in the village, came down with crowbars to assist us in breaking into the closed apartments and discovering the precious hoard. The first sight of these closed-up doorways gave us a strong desire to make the attempt; but on moving along we found that the Indians had been beforehand with us. In front of several were piles of stones, which they had worked out from the doorways, and under the lintels were holes, through which we were able to crawl inside; and here we found ourselves in apartments finished with walls and ceilings like all the others, but filled up (except so far as they had been emptied by the Indians) with solid masses of mortar and stone. There were ten of these apartments in all, 220 feet long and ten feet deep, which being thus filed up, made the whole building a solid mass; and the strangest feature was that the filling up of the apartments must have been simultaneous with the erection of the buildings, for, as the filling-in rose above the tops of the doorways, the men who performed it never could have entered to their work through the doors. It must have been done as the walls were built, and the ceiling must have closed over a solid mass. Why this was so constructed it was impossible to say, unless the solid mass was required for the support of the upper terrace and building; and if this was the case, it would seem to have been much easier to erect a solid structure at once, without any division into apartments.