The castle is well worth a look for its unique architecture, which many people have noticed looks like a boat marooned on top of a hill. It's also got great views over the lush surrounding hills and the historical town below. The one big drawback is that the castle now houses a museum of wine. Ordinarily I'm a big fan of all things wine related, but this museum is quite dull, and you have to go on a long, guided tour of the museum to see any of the castle. The town actually deserves a much higher wine profile, because it's at the center of the Ribera del Duero wine region, which produces some of Spain's most prestigious wine.