Small river boats glide up the Danube to this tiny 15th-century Austrian town, home to just 1,000 residents. The first sign you’ve arrived is the bright white and blue Stiftskirche, an imposing baroque-style church overlooking the river. Here is the center of the Wachau wine region, and the cobblestoned Hauptstrasse (the main street) is lined with bars and cafés to savor a crisp Riesling, the area specialty. It’s a welcome drink after a trek to the castle where King Richard the Lionheart was imprisoned in 1192. Most stops are a half-day, plenty of time to experience the town’s treasures.