By Laurent Granier and Megan Son br br The Qhapaq Ñan -- "Great Inca Road", or "Main Andean Road" -- constituted the principal north-south highway of the Inca Empire traveling 6000km along the spine of the Andes. Stretching from the south of Colombia and crossing Ecuador, Peru, Bolivia, and Argentina to arrive in Santiago de Chile, it allowed the Inca to control his Empire and to send troops as needed from the capital, Cusco. br br This teaser for a 4x26' documentary series recounts the human adventure of a young Franco-American couple, Megan Son and Laurent Granier, as they search for the Great Inca Road, the Qhapaq Ñan. In spite of daily physical challenges, their voyage addresses the need for this ancient route's protection, as cultural patrimony, visits the environmental issues that are inherent to the Andes as a great watershed, and learns about the social issues for the communities that live along this monumental road. br br www.qhapaq-nan.