LiDAR Reveals Hidden Urban System at Sacsayhuamán — Redefining Inca Capital Origins

Researchers from Italy's CNR ISPC (National Research Council, Institute of Cultural Heritage Sciences) published findings in April 2026 of a previously invisible urban infrastructure network at Sacsayhuamán Archaeological Park above Cusco, Peru, using drone-mounted LiDAR and high-resolution photogrammetry. The survey revealed a dense system of agricultural terraces, retaining walls, a secondary road network connecting the hilltop fortress to the Inca ceremonial core, rectangular building structures, and ancient looting trenches erased by centuries of erosion. These features were invisible at ground level and had escaped prior archaeological detection. The discovery forces scholars to reconsider how Cusco's capital zone developed organically from Sacsayhuamán downward — suggesting the fortress complex was integrated into a much larger planned urban landscape than previously recognized. Sacsayhuamán was seized by Spanish forces from Manco Inca's rebels in 1536 at great cost during the great Inca uprising; its stones were later quarried to build colonial Cusco. The new LiDAR data provides fresh evidence of the scale of what was destroyed. The research is part of a growing wave of remote-sensing archaeology reshaping understanding of pre-Columbian urbanism across the Americas.