viaduc de Cize-Bolozon 
Pic-nique aux bords de l'Ain (Jarbonnet) et promenade vers Viaduc de Cize-Bolozon, Ain.You can of course come and admire it up close. There is a small car park. Informative signs provide information about the history. If you prefer to admire the construction from afar, there are a number of walks in the area with great views. Don’t forget to take photos!
Since 1870, steam trains have passed over this bridge, then diesel-powered trains, and today the TGV high-speed trains continue to reinforce the importance of this bridge in connecting Bourg-en-Bresse and Oyonnax, and Paris and Geneva. The bridge as we see it today crosses over the Ain river and boasts eleven rounded arches over two levels. 273 metres of technical genius in a challenging environment! In the 19th century, the bridge was significantly damaged during sabotage operations led by the Maquis in July 1944. It was rebuilt to look almost identical to the original one but this time in concrete and covered in stone. It was then reopened for traffic in 1950. This bridge is a unique one in that the railroad tracks are on the top level, and cars can drive along the lower level.
Résistance En Normandie
Maquisards ArmesIf you still have some time left, you can also visit the Gouffre de Fontaine Noire. You’ll have a magnificent view of the Ain river, eight kilometres north east of Cize-Bolozon Viaduct, in the town of Corveissiat, near the chapel of Saint-Maurice d’Echazeaux.
