Les Gorges du Trient Opening hours De mai à octobre. Suggestions Bread Oven Trail “Chez-les-Pillet” offers a breathtaking view over the entire Rhône valley! Discover the hamlets and the bread ovens during your walk. Nature park Bois Noir In addition to its educational trails and fitness circuit, the Bois-Noir area comprises a wide variety of natural environments. Gueuroz bridge The Gueuroz Bridge is a reinforced concrete arch bridge located in Vernayaz. Between 1934 and 1963, it was the highest bridge in Europe.