One of the best-kept secrets in the wine world has to be Alto Adige in northeast Italy. For one thing, it’s relatively remote, lying a few hours north of both Venice and Milan. For another, it’s one of Italy’s smallest wine regions, with just under 15,000 acres of vineyards — compare that with more than 240,000 acres in Sicily, Italy’s largest. And yet, the mountainous Alto Adige (also known as Südtirol or South Tyrol), which borders Austria and where German is the dominant languag...