Castella di Amorosa is a replica of a castle in Tuscany. It's beautiful, with turrets to climb and many animals outside - goats, chickens, even ostriches!
There is a tour offered here but we heard it was very long. We walked around on our own and did a tasting. The wine here was some of the best we had of every place we went to in Napa. "The Lady" is phenomenal. Several very good whites as well. The pinot grigio was my favorite, the chardonnay was my husband's favorite (and one of the few bottles we bought while in Napa) and the sweet whites were good as well. The downgrade to four stars instead of five is just because they were a bit pushy after the tasting about purchases. Overall, though, a great experience!