Some tours of cellars are more unusual than others. Some of the champagne houses host you in their historic chalk-mining pits, sometimes on the site of ancient Gallo-Roman pits, dating back over 2000 years.
In these cathedral-like limestone caves, there are miles of underground galleries, and millions of bottles of champagne carefully laid to age for long periods.
These cellars, dug into the chalk, ensure a constant temperature, humidity and darkness, all of which are essential to the champagne production process.