Besides those we have attempted to describe, there are other ruins of which some remains of walls are standing; and contiguous thereto lie immense piles of worked stone, which, though presenting no new feature in the architecture of these buildings, yet serve to give a more adequate idea of the size and grandeur of this great city. In my walks in the vicinity, extending miles in every direction, I have seen broken walls and mounds, fragments of columns, and carved and sculptured stone, some of which were of as extraordinary dimensions as any that I have noticed, deeply imbedded in the soil, and wholly disconnected with any other structure; though they were, without doubt, the remains of splendid and extensive edifices. The following general characteristics of all these ruins may not be thought impertinent to my subject, by those who have had the curiosity to follow me thus far in the details:— They are situated upon a plain of many miles in circumference, nearly in the centre of the province; upwards of one hundred miles from the sea, and away from all water communication. They have no apparent order, or laying-out of streets, as the plan shows; but that they bear evidence of a people highly skilled in the mechanical arts, as also in a portion of the sciences, must be conclusive to my readers. The buildings which are now in the most perfect state of preservation, are the temple, castle, pyramid, and other erections, upon a succession of terraces composed of _rubble_, imbedded in mortar, held together by finished walls of fine concrete limestone: the sides of which are invariably located with reference to the four cardinal points, and the principal fronts facing the east. The walls of the buildings rise perpendicularly, generally, to one-half the height, where there are entablatures; above which, to the cornice, the façades are laid off in compartments, which are elaborately ornamented with stone sculpture-work over a diamond lattice ground, illustrated with hieroglyphic figures of various kinds; the whole interspersed with chaste and unique borders, executed with the greatest possible skill and precision. The stones are cut in _parallelopipeds_ of about twelve inches in length and six in breadth; the interstices filled up of the same material of which the terraces are composed. The height of these buildings generally is twenty, and rarely above twenty-five feet. They are limited to one story, long and narrow, without windows. The rooms are confined to a double range, receiving no other light than what passes through the doorway. The ceilings are built in the form of an acute-angled arch by layers of flat stones, the edges being bevelled and carried up to the apex, upon which rests a stone that serves as a key.