The INCA were an indigenous South American people who lived in the Andes Mountains of Peru. They were one of the largest and most advanced pre-Columbian civilizations in the Americas, with a complex political, social, and religious structure. The INCA Empire was the largest empire in pre-Columbian America, stretching from modern-day Ecuador to Chile. The INCA were renowned for their engineering feats, including the construction of roads, bridges, and terraces, as well as their sophisticated agricultural practices.