During our four-night stay in Vienna, we devoted one day to exploring the Wachau Valley, the historic and pastoral region along the banks of the Danube only an hour west of the city. It gained UNESCO world heritage status in 2000 to preserve the region’s unique cultural landscape, which includes steeply terraced ancient vineyards separated by quaint historic villages. Walter Juraschek, our guide from two days prior, picked us up from our hotel and led our day-long private tour. We…