In 1889, a single oak barrel holding 200,000 bottles' worth of champagne was dragged to Paris by twenty-four oxen, taking three weeks to cross France for the Universal Exhibition. Its owner was Eugène Mercier, and the stunt drew crowds away from Gustave Eiffel's new tower for several days. That instinct for spectacle defined the house from the beginning. Mercier founded his firm in 1858, at the age of twenty. He was not born into the trade. Where his neighbours on the Avenue de Champagne courted royal courts and foreign nobility, Mercier aimed at the emerging French middle class, producing a drier, more affordable cuvée and advertising it with a boldness his rivals found undignified. He commissioned hot-air balloons, early cinema films by the Lumière brothers, and posters that treated champagne as a democratic pleasure rather than an aristocratic one. Any epernay champagne tour mercier today still moves through the physical evidence of that ambition. Beneath the house lie eighteen kilometres of chalk galleries, quarried between 1871 and 1885 by workers cutting into the soft Cretaceous stone that underpins the whole town. The chalk holds a constant temperature near ten degrees and a high humidity, conditions that suit the slow second fermentation of méthode traditionnelle wines. Mercier ordered the cellars carved wide enough and straight enough for horse-drawn carriages, then for cars, then for the electric train that carries visitors through them now. Some 500 metres of the galleries are decorated with bas-reliefs sculpted directly into the chalk by Gustave Navlet between 1889 and 1902, depicting the harvest, the pressing and the seasons of the vine. The Avenue de Champagne itself was inscribed on the UNESCO World Heritage list in 2015, alongside the hillsides, houses and cellars of the wider region. Épernay sits at the junction of the Côte des Blancs and the Vallée de la Marne, and the avenue's mansions stand above roughly 110 kilometres of tunnels. Mercier's contribution to the streetscape is the grand entrance hall of 1885 and the great tun of 1889, which returned from Paris and now sits permanently on display, its carved panels by Navlet showing Bacchic figures and vine scrolls. What the house preserves is a record of how champagne became an industry as much as a wine. The lift that descends thirty metres, the laser-guided train, the barrel that beat the Eiffel Tower for attention — these belong to a lineage of marketing invention that shaped modern wine tourism. Visitors comparing epernay champagne tour mercier tours with the smaller grower-producers scattered through the Marne valley encounter two versions of the same landscape: one industrial and theatrical, one agricultural and quiet. Both grow Chardonnay, Pinot Noir and Meunier on the same chalk. The house remains at 68-70 Avenue de Champagne, 51200 Épernay, France, where it has stood since Eugène Mercier bought and consolidated a dozen small parcels of land to build it.