The minivan peels away from Miraflores and the city gutters thin into a ribbon of highway; within 45 minutes the ocean wind sharpens the light and the valley opens, pale and folded. At the edge of the Lurín valley the earth itself seems to change — terraces and adobe platforms climb in stepped bands, and the low, angular outline of the Temple of the Great God Pachacamac sits like a punctuation mark against the sky. On a guided half-day tour you don’t just pass through ruins: you walk into a place that once drew pilgrims from across the Peruvian coast to consult an oracle who, for centuries, shaped local ritual and politics.