As in many Old World countries, the rise of viticulture in Germany came about as a result of the Roman Empire, who saw the potential for vine cultivation in the vast flatlands around the base of the Rhine valley. Indeed, for over a thousand years, Germany's wine production levels were enormous, with much of the south of the country being used more or less exclusively for growing grapes. Over time, this diminished to make way for expanding cities and other types of industries, but Southern Germany remains very much an important wine region within Europe, with many beautifully balanced and flavorful German wines being prized by locals and international wine lovers alike. The hills around Baden-Baden and Mannheim are especially noteworthy, as these produce the high end of the characteristic semi-sweet white wines which couple so perfectly with German cheeses and pickled vegetables. However, all of Germany's wine producing regions have something special and unique to offer, and are a joy to explore and experience. Riesling grapes have been grown in and around central Europe for centuries, and over time, they became the lasting symbol of south Germany's ancient and proud wine culture. Whilst the reputation of German wines abroad has in the past been mixed, the Germans themselves take an enormous amount of pride in their wineries, and Riesling grapes have now spread around the globe, growing anywhere with the correct climate in which they can thrive. Riesling grape varietals generally require much cooler climatic conditions than many other white grapes, and they are generally considered to be a very 'terroir expressive' varietal, meaning that the features and characteristics of the terroir they are grown on comes across in the flavors and aromas in the bottle. It is this important feature which has allowed Riesling wines to be elevated into the category of 'fine' white wines, as the features of the top quality bottles are generally considered to be highly unique and offer much to interest wine enthusiasts.