That temperature means reduced evaporation from barrels -- typically saving one liter a month. As an offshoot, the cool, quiet caves are popular for everything from tastings, parties, concerts and tours. The New York Times magazine recently featured a cave dug by Magorian Mine Services that serves as a private art gallery underneath an 1887 farmhouse.

Magorian, 54, worked in the foothills area for several years as an engineer digging gold mines. He found his way to the Napa Valley wine country in 1998 after being called in by a contractor to do blasting work in a cave that was too difficult to cut.

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