America's Indian Summer is what we call Estate di San Martino in Italy. But not just surprisingly warm autumn temperatures are related to St. Martin's day on the 11th of November. This is also the time of the year the fermentation of new wines has come to an end, a process described by another Italian proverb related to St. Martin: A San Martino ogni mosto diventa vino (by St. Martin every must has turned into wine). And with the beach and festival season long gone and the weather forecast for Sunday looking wet and unfriendly, what better time to visit some of Tuscany's finest wineries . San Martino in Cantina is one of five national winery visit days the Italian Wine Tourism Movement organizes every year. Three dozens of wineries in the provinces of Siena and Grosseto adhere to the initiative and welcome visitors for a free autumn tasting in their wine cellars. On my quest to discover Tuscany's vineyards with a calling for architecture , I'll be tasting...