High on a hauntingly beautiful peninsula in Lake Umayo is the necropolis of Sillustani, where 28 stone burial towers represent a city of the dead that both predated and coincided with the Inca empire. The proper name for a tower is ayawasi (home of the dead), but they're generally referred to as chullpas, which are actually the shrouds used to cover the mummies inside. This was the land of the Aymará-speaking Colla people, and the precision of their masonry
rivals that of the Inca. Sillustani's mystique is heightened by the view it provides over Lake Umayo and its mesa-shape island, El Sombrero, as well as by the utter silence that prevails, broken only by the wind over the water and the cries of lake birds.
Most of the chullpas date from the 14th and 15th centuries, but some were erected as early as AD 900. The tallest, known as the Lizard because of a carving on one of its massive stones, has a circumference of 8.5 meters (28 feet). An unusual architectural aspect of the chullpas is that the circumference is smaller at the bottom than the top. To fully appreciate Sillustani, it's necessary to make the long climb to the top; fortunately, the steps are wide and it's an easy climb. Some schoolchildren will put on dances; if you take photos of mothers and children, and pet alpacas, a donation of a few soles will be appreciated.