What Winery is in a cave in napa valley?

Wineries use wine caves for aging the wine. You will normally find barrels of wines in the wine caves. The temperature is naturally ideal for storing the wine while it is being aged. Some wineries will have areas in the caves for events as well.

These Napa wineries have wine caves: Clos Pegase, Dutch Henry, Far Niente, Floral Springs, Paoletti Vineyards, Pine Ridge Vineyards, Quintessa Estates, Reverie on Diamond Mountain, Rudd, Rutherford Hill, and Schramsberg.