15.7211°S, 70.1583°W.
Sillustani is a pre-Inca burial complex on a peninsula extending into Lake Umayo on the Peruvian altiplano, 34 kilometres north of Puno at 3,950 metres elevation. The site is best known for its chullpas — cylindrical stone burial towers that mark the elite tombs of the Colla people, an Aymara-speaking polity that controlled the region from roughly 1200 CE until their incorporation into the Inca empire in the late 15th century. The largest tower, the Lagarto chullpa, stands 12 metres tall and is built of finely fitted ashlar masonry with the characteristic outward-flaring profile, taller at the top than at the base. The interiors held mummified remains in fetal positions surrounded by grave goods. Inca-period work after 1450 introduced finer ashlar courses to certain towers, and several show carved lizard reliefs that give the Lagarto its name.
The unfinished tower on the south end of the ridge preserves the construction ramp the masons abandoned mid-build.