long, still lies by the roadside. [Illustration: TIAHUANACU RESTORED. After a drawing given in _The Temple of the Andes_ by Richard Inwards (London, 1884).] The masonry of the ruins is admirably worked, according to the testimony of all visitors. Squier says: “The stone itself is a dark and exceedingly hard trachyte. It is faced with a precision that no skill can excel. Its lines are perfectly drawn, and its right angles turned with an accuracy that the most careful geometer could not surpass. I do not believe there exists a better piece of stone-cutting, the material considered, on this or the other continent.” It is desirable to describe these ruins, and especially the sculpture over the monolithic doorway, with some minuteness, because, with the probable exception of the cromlechs, they are the most ancient, and, without any exception, the most interesting that have been met with in Peru. There is nothing elsewhere that at all resembles the sculpture on the monolithic doorway at Tiahuanacu.[1150] The central figure, with rows of kneeling worshippers on either side, all covered with symbolic designs, represents, it may be conjectured, either the sovereign and his vassals, or, more probably, the Deity, with representatives of all the nations bowing down before him. The sculpture and the most ancient traditions should throw light upon each other. Further north there are other examples of prehistoric cyclopean remains. Such is the great wall, with its “stone of 12 corners,” in the Calle del Triunfo at Cuzco. Such is the famous fortress of Cuzco, on the Sacsahuaman Hill. Such, too, are portions of the ruins at Ollantay-tampu. Still farther north there are cyclopean ruins at Concacha, at Huiñaque, and at Huaraz. [Illustration: RUINS OF SACSAHUAMAN. [After a cut in Ruge’s _Geschichte des Zeitalters der Entdeckungen_. Markham has elsewhere described these ruins,—_Cieza de Leon_, 259, 324; 2d part, 160; _Royal Commentaries of the Incas_, ii., with a plan, reproduced in Vol. II. p. 521, and another plan of Cuzco, showing the position of the fortress in its relations to the city. There are plans and views in Squier’s _Peru_, ch. 23.—ED.]]