At the distance of a hundred and fifty or two hundred feet the passage enlarged to an irregular cavern, forty or fifty feet wide and ten or fifteen high. We no longer felt the rush of cold wind, and the temperature was sensibly warmer. The sides and roof were of rough, broken stone, and through the centre ran the same worn path. From this passage others branched off to the right and left, and in passing along it, at one place the Indians held their torches down to a block of sculptured stone. We had, of course, already satisfied ourselves that the cave or passage, whatever it might lead to, was the work of nature, and had given up all expectation of seeing the great monuments of art which had been described to us; but the sight of this block encouraged us with the hope that the accounts might have some foundation. Very soon, however, our hopes on this head were materially abated, if not destroyed, by reaching what the Indians had described as a mesa, or table. This had been a great item in all the accounts, and was described as made by hand and highly polished. It was simply a huge block of rude stone, the top of which happened to be smooth, but entirely in a state of nature. Beyond this we passed into a large opening of an irregular circular form, being what had been described to us as a plaza. Here the Indians stopped and flared their torches. It was a great vaulted chamber of stone, with a high roof supported by enormous stalactite pillars, which were what the Indians had called the columns, and though entirely different from what we had expected, the effect under the torchlight, and heightened by the wild figures of the Indians, was grand, and almost repaid us for all our trouble. This plaza lay at one side of the regular path, and we remained in it some minutes to refresh ourselves, for the closeness of the passage and the heat and smoke were becoming almost intolerable.