Cologne is located on the banks of the Rhine and is probably best known for producing Eau de Cologne and for its impressive Cathedral. The Cathedral is a magnificent 13th-century Gothic structure with a twin-spired structure, supported by 56 pillars and highlighted by splendid stained-glass windows. The Cologne museum complex contains paintings from Dutch and German masters as well as a great collection of modern art. Cologne is also famous for its wild carnival celebrations. Starting each year on the Thursday before Ash Wednesday, it is a definite must-see if you’re in the area.