Inca Architecture and Construction at Ollantaytambo

Jean-Pierre Protzen's 1993 Oxford University Press monograph — the foundational experimental-archaeology study of Inca polygonal masonry technique. Protzen, an architect by training, conducted on-site replication experiments demonstrating that the famous polygonal-interlocking stonework at Ollantaytambo (and by extension Sacsayhuamán, Machu Picchu, and other Inca sites) was achieved through hammer-stone pounding, test-fitting, and progressive refinement, all within documented Inca tool capability. The work remains the principal scholarly reference on Inca construction technique.