Puquios

The Puquios are an old system of aqueducts near the city of Nazca, Peru. Out of 36 Puquios, most are still functioning and relied upon to bring fresh water into the arid desert. The Puquios have never been fully mapped, nor have any been excavated.
Debate about age
There is conflicting research regarding when the aqueducts were actually built. Many archaeologists contend that they were built by Pre-Columbian Nazca architects around A.D. 540 in response to two prolonged droughts during that time. There is a general lack of historical reference both after and prior to the Spanish Empire. The first historical writing of their existence was in 1605 by Reginaldo de Lizárraga, which some contend may indicate that they were built by the Spanish. There, however, is yet no evidence from Spanish texts that mentions a project to build the Puquios.
In their book Irrigation and Society in the Peruvian Desert, Katharina Schreiber and Josue Lancho Rojas explore...