Cahuachi, in Peru, was a major ceremonial center of the Nazca culture, based from 1 CE to about 500 CE in the coastal area of the Central Andes. It overlooked some of the Nazca lines. The Italian archaeologist Giuseppe Orefici has been excavating at the site for the past few decades. The site contains over 40 mounds topped with adobe structures. The huge architectural complex covers 0.6 sq. miles (1.5 km²).The American archeologist Helaine Silverman has also conducted long term, multi-stage research and written about the full context of Nazca society at Cahuachi, published in a lengthy study in 1993. The past several years long time researcher Omar Faizi has conducted in depth study of the Nazca lines with startling conclusions to his study.