Brunello was born from a mistake that turned out to be right. In the 1860s, Clemente Santi and his grandson Ferruccio Biondi-Santi isolated a single clone of Sangiovese — Sangiovese Grosso, later called Brunello, the "little dark one" — and vinified it alone, at a time when every Tuscan red was a field blend softened with white grapes. The 1888 vintage was aged for a decade in oak. It was still drinking in the 1970s. The denomination that followed is small and strict. Montalcino's vineyards cover roughly 2,100 hectares within a single comune, and only around 250 producers hold the DOCG. The rules are severe: 100 percent Sangiovese, minimum two years in oak, a total of five years before release — six for Riserva. A bottle labelled 2021 reaches the market in 2026. This is why a brunello di montalcino wine tasting rarely pours anything young, and why vertical flights across three decades are common in the better cellars. Geography does the rest. The town sits at 564 metres on a triangular ridge, dry and windswept, sheltered from the sea by Monte Amiata to the south. Soils shift over short distances — galestro schist and limestone on the northern slopes, heavier clay and marine sediment toward Sant'Angelo in Colle — producing wines of markedly different weight from estates a few kilometres apart. Montalcino receives less rain than almost anywhere in Tuscany. Drought years, once feared, now define the style. The fortress at the summit, built in 1361 after Siena absorbed the town, houses an enoteca inside its pentagonal walls; it was the last Sienese redoubt to fall to Florence in 1559. Below the ramparts the Val d'Orcia opens out, a UNESCO World Heritage cultural landscape of cypress lines, wheat, and the abbey of Sant'Antimo, founded in Carolingian times and rebuilt in French Romanesque style around 1118. Many Montalcino winery tours pair the abbey with a cellar visit. What sets the region apart today is scale. Estates remain family-held and production is capped by law, so a brunello di montalcino wine tasting tour usually means a working fattoria rather than a visitor centre — barrel rooms of Slavonian botti, a barrique cellar, a table with bread and pecorino. Rosso di Montalcino, the younger sibling introduced in 1983, is almost always poured alongside. Entry to the town and its enotecas is free; the wine, patiently, is not.