As Crystal Mozart approaches a gentle bend in the Danube, the village of Dürnstein comes into sight—and it makes a dazzling first impression with the distinctive blue and white tower of the old town’s Abbey Church and, up above, the rocky ruins of a 12th-century castle. Take the steep (but blessedly brief) climb up to explore. And consider that within these walls Richard the Lionhearted was held prisoner after being captured on his way home from the crusades. From up here, the sublime views of the Wachau Valley, a premier wine-growing region, extend forever. Along the Austrian Wine Trail, vineyards and tasting rooms pour the local wines, including Grüner Veltliner and Rieslings, which often have a cool mineral tang resulting from the stony growing fields.