Casto Oaks Fine Wine and Art, Mount Bullion Vineyard, which produces wine labeled Casto Oaks. From smooth cabs to jammy zins, this family winery produces great wines all from Mariposa County grapes. The gallery is always changing and finding creative local artists, representing a variety of media. Oils, acrylics, watercolors, photography, pottery, and jewelry create stellar gallery offerings. Looking for a special gift? They are always refreshing their downtown shop. Select from picnic and wine totes, etched wine glasses, decorative water bottles, coasters, and more.