I have never had the pleasure to visit the UK and see for myself the amazing castles over there. In the US this winery is one of the only places in the states that built a medieval castle that is open to the public. They also have very good wine in their cellars and have events throughout the year. Worth a visit if you ever go to Napa.
I attended their halloween party last year at the castle and it was the best halloween party ever. Their wine is okay, but the experience of the castle is why you want to visit this winery. Their pinot nero is the only wine I think that is worth buying.