That's what really got me in France - old railway lines that have been converted into great cycle paths. It goes on good ground over bridges and tunnels (illuminated) without noticeable increases through the country. Everything is mostly well signposted.
Stone bridge with three arches. A stone door with pediment, gives access to the bridge and to the city. Opposite, another door of the same style is flanked by pedestrian …
The V83 winds its way through hilly landscape on little-used paths at a reasonable distance from the main ridge of the Pyrenees, which can be seen through again and again. A wonderful route.