Inca road system. Among the many roads and trails constructed in pre-Columbian South America, the Inca road system (El Camino Inca) of Peru was the most extensive.  Traversing the Andes mountains and reaching heights of over 5,000 m (16,500 feet) above sea level, the trails connected the regions of the Inca Empire from the northern provincial capital in Quito, Ecuador past the modern city of Santiago, Chile in the south.  The Inca road system covered approximately 22,500 km (14,000 mi) and provided access to over three million km² of territory.
self-made from the images on this and this and this pages and mainly from the image in the book Inca Road System by John Hyslop.
Manco Capac