If you have time for only one castle in Tuscany, this should be it. At the end of the 12th century, when Florence conquered southern Chianti, Brolio became Florence's southernmost outpost, and it was often said, "When Brolio growls, all Siena trembles." It was built about AD 1000 and owned by the monks of the Badia Fiorentina. The "new" owners, the Ricasoli family, have been in possession since 1141. Bettino Ricasoli (1809–80), the so-called Iron Baron, was one of the founders of modern Italy and is said to have invented the original formula for Chianti wine; you can also visit the on-site Barone Ricasoli winery for a guided cellar tour and wine tasting.
Brolio, one of Chianti's best-known labels, is still justifiably famous. The grounds are worth visiting, and some of the guided tours do provide a glimpse of the castle's interior. The entrance fee includes a wine tasting in the enoteca. A small museum, where the Ricasoli Collection is housed in a 12th-century tower, displays objects that relate the long history of the family and the origins of Chianti wine. There are various options for an overnight here.