The engraving which follows represents this building. It stands on a terrace, and may be considered as consisting of two separate structures, one above the other. The lower one, in its general features, resembled all the rest. It was forty feet front, low, and having a flat roof, and in the centre was an archway running through the building. The front is fallen, and the whole so ruined that nothing but the archway appears in the engraving. Along the middle of the roof, unsupported, and entirely independent of everything else, rises a perpendicular wall to the height of perhaps thirty feet. It is of stone, about two feet thick, and has oblong openings through it about four feet long and six inches wide, like small windows. It had been covered with stucco, which had fallen off, and left the face of rough stone and mortar; and on the other side were fragments of stuccoed figures and ornaments. An Indian appears before it in the act of killing a snake, with which all the woods of Yucatan abound. Since we began our exploration of American ruins we had not met with anything more inexplicable than this great perpendicular wall. It seemed built merely to puzzle posterity. These were the only buildings in this immediate neighbourhood which had survived the wasting of the elements; but, inquiring among the Indians, one of them undertook to guide me to another, which he said was still in good preservation. Our direction was south-southwest from the Casa Grande; and at the distance of about a mile, the whole intermediate region being desolate and overgrown, we reached a terrace, the area of which far exceeded anything we had seen in the country. We crossed it from north to south, and in this direction it must have been fifteen hundred feet in length, and probably was quite as much in the other direction; but it was so rough, broken, and overgrown, that we did not attempt to measure it. [Engraving 6: Terrace and Building] On this great platform was the building of which the Indian had told us; I had it cleared, and Mr. Catherwood drew it the next day, as it appears in the engraving opposite. It measures one hundred and seventeen feet in front, and eighty-four feet deep, and contains sixteen apartments, of which those in front, five in number, are best preserved. That in the centre has three doorways. It is twenty-seven feet six inches long, by only seven feet six inches wide, and communicates by a single doorway with a back room eighteen feet long and five feet six inches wide. This room is raised two feet six inches above the one in front, and has steps to ascend. Along the bottom of the front room, as high as the sill of the door, is a row of small columns, thirty-eight in number, attached to the wall. In several places the great platform is strewed with ruins, and probably other buildings lie buried in the woods, but without guides or any clew whatever, we did not attempt to look for them.