This episode investigates the extraordinary stonework of Puma Punku, a shattered megalithic complex built at extreme altitude on the Andean plateau. We examine the site within the context of the Tiwanaku civilisation, analysing the scale, transport, and precision of its massive andesite and sandstone blocks. Particular focus is given to the site’s razor-sharp cuts, interlocking H-blocks, flawless geometry, and modular design—features that demand an extraordinary level of planning, measurement, and craftsmanship. These elements are assessed alongside what archaeology does reveal about Tiwanaku engineering, organisation, and ceremonial architecture.

Mainstream archaeological explanations are presented alongside the unresolved problems that continue to challenge them, including the absence of suitable tools, the difficulty of stone transport at high altitude, and the unmatched precision seen nowhere else in Tiwanaku construction. Rather than advancing speculative conclusions, this investigation concentrates on what the physical evidence demonstrates—and where it falls silent. Puma Punku emerges not as an anomaly detached from its culture, but as a site that pushes the limits of what ancient engineering is typically assumed to be, raising deeper questions about lost techniques, specialised knowledge, and how easily sophisticated understanding can vanish from the historical record.