A must-visit if you're looking for Napa's roots. The château, built by sea captain turned wine pioneer Gustave Niebaum, has watched over the valley since 1880. Movie director Francis Ford Coppola bought the estate in 1975 and reunited all the original vineyards.
The tour here gives you a look at a mind-boggling 2 million bottles of bubbles in 2 miles of underground caves that were dug out in 1862. Festooned with lichen and dug deep into the mountain, they evoke the ancient caves of Champagne, France—but are more gothic and mysterious.
Thanks to the rise of urban wineries, your next spontaneous tasting may be even closer than you think. Check out The Portland Wine Project, a twofer (Boedecker Cellars and Grochau Cellars together) in the Northwest industrial area.