Moet et Chandon, founded in 1743, is the largest of the great champagne houses and the public face of the Avenue de Champagne. The headquarters at number 20 fronts a chateau-like courtyard with a statue of Dom Perignon out front, and the public tour takes you down into a small section of the 28 kilometres of cellars beneath your feet.
Tours run several times a day in French and English; the basic visit includes one glass of brut Imperial, the longer "Grand Vintage" tour adds vintage tastings. Book ahead, especially at weekends and in summer.