Originating in the Black Forest in Germany and finishing in Black Sea, the Danube is the second longest river in Europe. Those looking to explore Danube Valley in Austria should make their way to Wachau (the valley between Krems an der Donau and Melk). Here, travelers will enjoy beautiful landscapes covered with vineyards, fortresses and forests. Wine connoisseurs should stop by one of the wine-producing villages for a glass of homemade wine. If you want to get lost in nature, head to Danube-Auen National Park, which covers 93 square kilometers and preserves the last remaining major wetlands environment in Central Europe.