The wine cellars of Bouvet Ladubay in France are up to 40m under ground, but you can cycle around the area. — Bouvet Ladubay/dpa
There is a short cycle route through the Loire in France that leads right through the Bouvet Ladubay wine cellar in Saumur, past hundreds of oak barrels storing sparkling wine.
You will not find the route marked on any maps; it has no name and is only 8km long.
