Ruta 40, ArgentinaRunning parallel to the Andes Mountains in Western Argentina and stretching all the way from Punta Loyola near Rio Gallegos in Santa Cruz Province in the south to La Quiaca in Jujuy Province in the north, this 5000 kilometer stretch of road is one of the longest in the world and possibly the most beautiful and diverse. Why? Well, it starts at sea level and goes up to 16,404 ft in Salta, passes through 20 national parks, 18 major rivers and 27 mountain passes. This road offers a stunning variety of views to all kinds of travelers. Happy road tripping!