Ancient Advanced Technology in South America

There are a host of ancient ruins in South America, claimed by the Inca, inherited by the Inca, conquered by the Inca and built by the Inca. Although one label has stuck on each monument or ancient site, it is clear there are many layers of construction, physically and conceptually. Academics and Scholars still debate who built these, monuments, did they inherit them? Was there a Pre-Inca culture, but everyone can appreciate how advanced the 'Inca Ancient Ruins' found in the highlands of So...