The Truth Behind: Who Were the Nasca?
The Nasca were a sophisticated, desert-dwelling people -- they also practiced human sacrifice.
Throughout the past, there may have been contact between human tribes and cultures and alien visitors from beyond the world. The evidence in cave drawings, paintings, religious texts and elsewhere indicates this likely occurred. An important perspective on ET contact and its historic and present-day implications is presented in the Allies of Humanity Briefings.
I highly recommend you read this document. http://www.alliesofhumanity.org