Napa Valley's Dolce Winery is the only winery in North America that is solely devoted to producing a single, late harvest wine. It is one of the few wineries in the world willing to make such a commitment, sharing a common philosophy with the great Sauternes producers of Bordeaux. Dolce cellar is located within the caves of its sister winery, Far Niente, in California's Napa Valley. Visitors to the winery are welcomed with a hosted tour, followed by a tasting of current and library vintages. By its nature, Dolce is a rare wine that cannot be produced every year. Dolce is made when a natural, beneficial mold called botrytis cinerea attacks the grapes on the vine, while evaporating the water content and concentrating the sugars, acids and flavors. The inaugural 1985 vintage yielded only six barrels, and production grew to nine barrels in 1986. The 1987 vintage was not fine enough to be bottled and 1988 was so warm that no botrytis formed and the grapes were never harvested. The 1989 vintage was the first commercial release of Dolce and it was introduced to the market in 1992. Visits are by appointment, only.