Seen from above, the spirals formed in the middle of the Peruvian desert by the "water eyes" are frightening.
They are part of a pre-Columbian system of underground aqueducts, which, from the Andes, continue to irrigate three valleys in the region of the famous Nazca geoglyphs.
Built approximately 1,700 years ago near Nazca, 450 kilometers south of Lima, the aqueducts extend like branches forming a system of shafts and channels made of stones and beams of huarango, a Peruvian coastal tree.
The work is a marvel of hydraulic engineering initiated by the ancient Nazca culture's inhabitants. Its . . .