The path over the ridges of Frahan was made by Touring Club in the 1920s, as well as practically the entire path to Alle, through an area that was previously almost inaccessible. You pass by The Roche Plate and Round Roche, followed by the Rocks of the Fourhemian Children and the Ros Beiaard. There are some short ladder passages, some of which are not necessary. In the neighbourhood of the ladders, a strategic place with the Semois nearby on both sides, was once built (11th -13th century?) the never completed castle of Montragut. Residues of foundations can be recognized if you look for them.