As result of man’s pressing need to trade and travel, around forty structures bridge the distance over the Valserine and its small tributaries. Of these forty structures, some provide a wonderful opportunity to discover the valley and its landscapes. Just upstream from Mijoux, the natural bridge of La Giboulette is a limestone archway that was dug out by an adjacent stream. Downstream from Lélex, one of the oldest bridges - the Rouffy bridge - will allow hikers to follow the river at the bottom of the valley. Under Montanges, the Moulin des Pierres bridge was built as a tramway crossing in 1909 and overlooks the gorges: the view is dizzying! Finally, just before Bellegarde, you can still visit the old “Pont des Oules”, which was initially merely a limestone slab placed straight across the Valserine waterfall, and which was used by the Helvetii in 58 B.C.