The Barbera wine route follows the hills down to Isola d'Asti and then climbs again up to San Martino Alfieri, the last two stops on the tour.
Visit the fragmentary remains of the castle at Isola d'Asti and the fresh water spring, the sulphur-rich Imperia.
From Isola cross the Asti-to-Alba main road and head for the hills opposite for four kilometres before arriving at San Martino Alfieri. Houses cluster round Castello Alfieri, a grand XVIII-century building with its own park and with enormous sumptuously decorated and frescoed rooms. Inside, you can see the study where the Piedmontese poet Vittorio Alfieri worked and where his books and papers are now kept. Today the Castello is also home to a winery, which organises tours of some of the rooms as well as tastings.