The Hanseatic City of Hamburg, with about 1.7 million inhabitants is the largest city in Germany . The free city is located on the Alster Lake estuary in northern Germany and at the confluence with the Elbe river Bille . Hamburg was by the Treaty of Lübeck ( 1241 ) to the birthplace of the Hanseatic League. Also, this city is by the harbor a very important commercial and industrial center , the harbor is the second largest ever in Europe. Hamburg is one of the most popular tourist destinations when it comes to Germany . According to statistics found in this attractive city of more than 100 million visitors , of overnight stays amounted to almost 10 million annually. The numerous theaters, museums and galleries internationally famous are popular visitor destinations . The landmark of the city is the Protestant church St. Michaelis , primarily known by sailors rather than historical " Michel " . The large bronze Archangel Michael stands over the main entrance and is of the incoming ships far more visible. Hamburg city center , you should have seen in any case. Here numerous outdoor events. The downtown refers to the entire area around the Inner Alster Lake , which also includes the famous St. Pauli district belongs . For this district one go about 930 meters long Reeperbahn , which is also referred to as the most sinful course in the world . St. Pauli is a so-called entertainment and red-light district , where the city's nightlife is concentrated . The Reeperbahn, Alster , the harbor and the fish market , as well as the warehouse district with the beautiful miniature wonderland among the most attractive sights in Germany . Regular hamburger highlights include among others the world-famous fairs "Inter- organization " and "Hanse Boat" , and the annual Jumping Derby and the German Tennis Championships . But the Hamburger Dom , the popular folk festival may have millions of visitors annually .