One of Europe’s great waterways, the Rhine River runs all the way from the Alpine mountain ranges of Switzerland to its vast delta on the North Sea. Forming a natural border between Germanic peoples and external influences since Roman times, the river has been an important symbol of German nationalism through history, spawning its own version of romanticism and even forming the basis for Richard Wagner's first opera, “Das Rheingold.” Of the cities it runs through, Cologne is the biggest, with more than a million inhabitants—and it boasts many attractions, among them river cruises that allow visitors to enjoy the views of the city while cruising the calm waters. Select tours from Frankfurt highlight a section of the Rhine Valley that’s a UNESCO World Heritage Site, punctuated by villages, vineyards, and castles. Downstream from Mainz in the Upper Rhine, you’ll spot naturally occurring river islands. In the Middle Rhine, Koblenz unites the joining of the Moselle River with a gorge that’s part of that UNESCO site; while a little futher down, the magnificent Burg Katz towers over the legendary Lorelei rock. The famed wines of the region are nowhere better than in Boppard, where the sweet eiswein (or icewine) is a local delicacy and can be tasted on a tour. For your best chance of seeing the Rhine in all of its splendor, book a tour or cruise, and ensure easy sailing through the Rhine.