This pleasant route alternates between forest ridge paths and country lanes, allowing you to discover the Mercureaux and Arguel/Pugey valleys, with their meandering streams running through the fields. Take advantage of the paths through the undergrowth and the small, little-travelled roads. Along the way, you'll come across religious and military heritage sites, as well as magnificent viewpoints, including the Vauban Citadel, a UNESCO World Heritage Site.