In the heart of Peru's Sacred Valley, a hidden chamber within an Inca-era quarry has revealed a cache of obsidian-tipped chisels and copper mallets wrapped in finely woven alpaca wool. Unlike standard mining tools, these instruments are highly decorated with sun-burst patterns and were buried with offerings of fermented chicha, pointing to their use in the Festival of the First Stone.
Researchers from the Cusco Archaeological Project explain that this festival took place before the construction of new imperial monuments began each spring. The ritual involved the "awakening" of the mountain's spirit to ensure the stability of the stones. This find provides concrete evidence for the spiritual dimension of Inca engineering, showing that every major building project was inaugurated with a dedicated communal festival.