Puma Punku: Precision Stonework and a Civilization’s Lost Technical Memory

At about 3,850 metres on Bolivia’s Altiplano, near Lake Titicaca, a broken stone platform sits among huge blocks. This is Puma Punku, a temple complex within the city of Tiwanaku. Large sandstone slabs lie beside dark volcanic andesite blocks. Andesite is a hard volcanic rock. Many surviving pieces still show straight edges, right angles, deep grooves, drilled holes, and repeated H-shaped forms.

Tiwanaku was not a small village. A 2023 chronology places its major growth between roughly AD 400 and 900, when it became a political and religious centre for the southern Andes. Its buildings followed planned directions, its foundations were levelled and compacted in layers, and underground channels carried rainwater away. Puma Punku belonged to that building programme. The direct question is simple: how did a society without modern machines bring stone from distant sources, cut matching details, and assemble them on a high plateau where oxygen is scarce?