The croissant reached Paris as an import. In 1839 an Austrian officer named August Zang opened the Boulangerie Viennoise on rue de Richelieu and sold kipferl to a city that had never folded butter into yeasted dough. The laminated version French bakers now call a croissant was codified only in the early twentieth century. Technique, not tradition, is what baking classes in Paris for tourists inherit from that exchange. Galeries Lafayette carries a comparable lineage. Théophile Bader and his cousin Alphonse Kahn opened a small haberdashery near the corner of rue La Fayette in 1894, then expanded along Boulevard Haussmann until the shop filled an entire block. Bader's ambition was retail as spectacle: a shop people would enter without intending to buy. The neo-Byzantine coupole was inaugurated in 1912 — a dome of steel and stained glass rising roughly forty-three metres above the ground floor, drawn under architect Ferdinand Chanut with glasswork by the Nancy master Jacques Gruber. Its Art Nouveau balconies were designed so that merchandise faced the whole atrium at once. The building at 40 Boulevard Haussmann was conceived as a theatre of commerce, and it still behaves like one. Food followed the crowds. The gourmet hall made the store one of the city's larger showcases for regional cheese, charcuterie and viennoiserie, and the macaron — two almond-meringue shells bonded with ganache, a Parisian refinement usually credited to Ladurée's Pierre Desfontaines around 1930 — became its most photographed sweet. The glass floor and rooftop terrace, added far later, extended the same logic upward. Pastry workshops now run inside the same envelope, and the sessions catalogued as baking classes in Paris for tourists tours sit a few metres from the counters selling the finished article. A cours de pâtisserie held here is therefore also an architectural visit. That overlap is rare among Paris landmarks. Most culinary instruction in the capital happens in basements and back kitchens; this one sits beneath a listed dome in the 9th arrondissement, a short walk from the Palais Garnier and the Grands Boulevards. Careful restoration has kept the stained glass and the wrought-iron balustrades legible for more than a century, which is why demand for baking classes in Paris for tourists tickets tracks the sightseeing calendar as closely as the culinary one. The lesson ends with something edible. The building was already the point.