The National Museum of Peru (MUNA) sits on the western edge of the Pachacamac Archaeological Sanctuary, in the Lurín Valley, a territory with more than three millennia of continuous occupation. Conceived as a contemporary kancha andina, the building is organized around a 126-by-126-meter quadrangle and a central void, set within a depression shaped by decades of sand extraction. Nearly seventy percent of the program is located underground, reducing the museum’s visual impact and improving its seismic and thermal performance, while platforms, patios, and a mobile concrete envelope regulate light, temperature, and the building’s visual connections.