Pre-Columbian America’s most advanced aqueducts and drainage systems, as well as the most comprehensive road system, were built by the Incas. They were also the first to develop the process of freeze-drying food and the rope suspension bridge, both of which they developed independently of any outside influence.
Inca zig zag road The Incas were superb builders and architects. They constructed a network of roads and bridges that traversed the most treacherous terrain in the Andes. The Incas were able to ensure a limitless supply of physical labor because to their system of communal work and the most advanced organized economy of any ancient civilization.