Take the GR 65 route to St Jacques de Compostela before discovering the remains: the castle ruins and the site Mauchamps "Vieille Cure." Then you will follow the footsteps of your ancestors, following the route of an ancient Gallo-Roman path.
From the square in the centre of Grésin follow the red and white markings of the GR65 towards St Maurice de Rotherens. After the church of St Maurice de Rotherens, follow the yellow arrows of the Balcons de St Maurice path.