Gran Saposoa is the name given to a series of ruins in the Andean cloud forests of the Amazonas region of Peru by American explorer Gene Savoy. Savoy hypothesized that this site is the Pre-Columbian city of Cajamarquilla, built by the Chachapoyas culture, but "Cajamarquilla" is clearly identifiable in historical documents as the renamed modern highland town of Bolivar. Savoy claims that the ruins, consisting of hundreds of round stone structures, cover approximately 80 square miles (that's about the size of Baltimore, MD). He estimates that the settlement was home to 20,000 occupants.[1]

• http://en.wikipedia.org/wiki/Gran Saposoa