Although I was unable to visit either the ruins at Tiahuanaco or those on the islands, I found time to examine ruins of the same character on the shores of the lake of Umayu near Vilque, where the great cemetery of the chiefs of the Aymara tribes of the Collao appears to have been. These ruins are at a place called Sillustani, on the north side of the lake of Umayu, where a high rocky table-land juts out so as to form a peninsula, which is literally covered with places of sepulture. Four of them are towers of finely-cut masonry, equal to that of Cuzco, with the sides of the stones dovetailing into each other. On climbing up the steep rocky path which leads to the table-land, the first on the right-hand side is perched on the very edge of the northern precipice. Half of it is destroyed, the other half is of well-cut stones, with a broad rounded cornice near the summit, and a vaulted roof, part of which remains entire. In the interior, near the foundation, there is a vaulted chamber entered by a small aperture, and full of human bones. The rest of the tower was filled up with small stones and earth, leaving a narrow shaft which ascended from the chamber to the summit, down which the bodies may have been lowered into the chamber. On the left there is another smaller tower of exactly similar construction. Further on, and near the verge of the southern precipice, there are two other towers close together. One is thirty-six feet high, and built of the same well-cut masonry, with a cornice and vaulted roof, and a great lizard carved in relief on one of the stones near the base, which measures six feet by three.[153] The other tower was apparently exactly similar, but it is now in a very ruinous state. Besides these more remarkable edifices, the table-land is covered with other towers of rough unhewn stone and earth, and there are the remains of two square edifices built of cyclopean stones. The fallen parts of the towers were covered with masses of bright yellow compositæ called _suncho_, and a purple solanum; and they were frequented by the creepers called _haccacllo_, little green paroquets, a small quail called _pucupucu_, and the little ground-dove _cullca_; numbers of _biscache_ rabbits burrowed in the ruins, while two or three lordly _coraquenques_ soared in circles over the table-land. After carefully examining the old towers of Sillustani, I passed the night in a very small hut, close to the lake of Umayu, the waters of which were smooth as glass, an island in the centre, and blue ranges of mountains capped with snow in the distance. To get into the hut it was necessary to go on hands and knees, the doorway being only three feet high, with a hide door stretched on a wooden frame. The hut was built of rough stones and thatched with barley-straw; but inside there was a hospitable welcome and good cheer: the old Indian who dwelt there, and his young daughter, providing excellent boiled potatoes, cream-cheese, and fresh milk.