The monuments of San Juan Teotihuacan are, with the exception of the temple of Cholula, the most ancient remains, probably, on the Mexican soil. They were found by the Aztecs, according to their traditions, on their entrance into the country, when Teotihuacan, _the habitation of the gods_, now a paltry village, was a flourishing city, the rival of Tula, the great Toltec capital.[203] The two principal pyramids were dedicated to _Tonatiuh_, the Sun, and _Meztli_, the Moon. The former, which is considerably the larger, is found by recent measurements to be six hundred and eighty-two feet long at the base, and one hundred and eighty feet high, dimensions not inferior to those of some of the kindred monuments of Egypt.[204] They were divided into four stories, of which three are now discernible, while the vestiges of the intermediate gradations are nearly effaced. In fact, time has dealt so roughly with them, and the materials have been so much displaced by the treacherous vegetation of the tropics, muffling up with its flowery mantle the ruin which it causes, that it is not easy to discern at once the pyramidal form of the structures.[205] The huge masses bear such resemblance to the North American mounds that some have fancied them to be only natural eminences shaped by the hand of man into a regular form, and ornamented with the temples and terraces the wreck of which still covers their slopes. But others, seeing no example of a similar elevation in the wide plain in which they stand, infer, with more probability, that they are wholly of an artificial construction.[206] The interior is composed of clay mixed with pebbles, incrusted on the surface with the light porous stone, _tetzontli_, so abundant in the neighboring quarries. Over this was a thick coating of stucco, resembling, in its reddish color, that found in the ruins of Palenque. According to tradition, the pyramids are hollow; but hitherto the attempt to discover the cavity in that dedicated to the Sun has been unsuccessful. In the smaller mound an aperture has been found on the southern side, at two-thirds of the elevation. It is formed by a narrow gallery, which, after penetrating to the distance of several yards, terminates in two pits or wells. The largest of these is about fifteen feet deep,[207] and the sides are faced with unbaked bricks; but to what purpose it was devoted, nothing is left to show. It may have been to hold the ashes of some powerful chief, like the solitary apartment discovered in the great Egyptian pyramid. That these monuments were dedicated to religious uses, there is no doubt; and it would be only conformable to the practice of antiquity in the Eastern continent that they should have served for tombs as well as temples.[208]