Napa Valley Factory is a winery located in California's Napa Valley. It is known for producing high-quality wines, and has been in operation since the late 19th century. The winery specializes in producing Cabernet Sauvignon, Chardonnay, Merlot, and Zinfandel wines. It also produces a variety of other wines, including sparkling wines, dessert wines, and fortified wines. The winery is a popular tourist destination, offering tastings, tours, and events.