I have visited the Wine Cellar of G.H. Mumm Champagne in Reims.
A visit with a very expert guide was amazing. You can learn and see all the steps of process – how the grapes become a delicate champagne and quality levels of grapes.
You have an opportunity to smell the cellar and also touch barrels, casks and bottles which are just in the process of fermentation.
Of course your visit ends with an amazing champagne tasting.