Brunello di Montalcino was effectively the invention of one family: in the 1880s Ferruccio Biondi Santi isolated a single Sangiovese clone, aged it for years in Slavonian oak, and produced a wine that outlived every other Tuscan red of its era. A century later, in 1980, it became the first Italian wine granted DOCG status. The hills that produced it are the same hills that surround any val d orcia brunello wine tour today. The valley itself is a work of agriculture rather than nature. Siena reorganised the Orcia basin in the fourteenth and fifteenth centuries, clearing woodland, draining marsh, and laying out the mezzadria sharecropping estates whose farmhouses still crown the ridgelines. The resulting pattern — wheat on the flats, vines and olives on the slopes, cypress avenues marking the drives — was so deliberately composed that Sienese painters used it as a template for the ideal governed landscape. Ambrogio Lorenzetti's frescoes in the Palazzo Pubblico show it plainly. UNESCO inscribed the region in 2004 on precisely those grounds: a cultural landscape, not a wilderness. Geology explains the wine. The soils shift within a few kilometres from galestro, a friable schistose clay, to alberese limestone, with marine sediments beneath. Montalcino's hill rises to 564 metres and shelters the southern slopes from Apennine weather while the sea breeze off the Maremma dries the fruit. Vineyards north of the town yield leaner, slower wines; those toward Sant'Antimo ripen fuller and earlier. Producers must age Brunello for five years before release, six for the riserva, which is why a cellar visit on a Val d'Orcia wine tasting day trip so often means walking past vintages a visitor cannot yet buy. The wider valley carries its own architecture. Pienza was rebuilt from 1459 by Bernardo Rossellino for Pope Pius II as a model Renaissance town, its trapezoidal piazza calibrated to the light. The Abbey of Sant'Antimo, Romanesque and alabaster-walled, stands alone in a field below Castelnuovo dell'Abate. Bagno Vignoni replaced its village square with a thermal basin. Montepulciano answers Montalcino with Vino Nobile, a different Sangiovese expression from higher, cooler ground. These places are stops on almost every val d orcia brunello wine tour, and together they explain why a region of roughly sixty thousand inhabitants exerts a pull far beyond its size.