There is a small museum in Voiron about the products of the Chartreuse monks. A guided tour of the cellars is free of charge. The tour includes a 3d movie and a liqueur tasting. (Very interesting)The boutique has great quality price product.
I recommand it to all.
If you want to know more about the monks they have a museum next to their monastery in St Pierre de Chartreuse . Worth the detour! The area is beautiful









