Sillustani is a pre-Incan burial ground on the shores of Lake Umayo, about an hour’s drive from Puno in Peru, which is a large city on the shore of Lake Titicaca. The tombs, which are built above ground in tower-like structures called chullpa, are the vestiges of the Colla people, Aymara speaking people who were conquered by the Inca in the 15th century.