Exploring the Mysteries of the Andes May 8, 2015 1000 × 750 Exploring the Mysteries of the Andes Sillustani: Chullpas These ancient round burial chambers found at Sillustani are known as Chullpas. Here are some of the older Chullpas, which overlook Lago Umayo and Isla Umayo. © Robin Heyworth – Photo taken 28th March 2002