Harbour of Flensburg.
Third largest town in Schleswig-Holstein, Flensburg has a long history as a merchant port. In the 16th century it already traded as far as the Mediterranean, Greenland and the Caribbean. In the 18th century, cane sugar was imported from the Danish West Indies and refined in Flensburg. The main sight is the Maritime Museum, which has an interesting section of the rum trade.
In May 1945, following Hitler's death, Flensburg was the seat of the last government of Nazi Germany, under Admiral Dönitz.
Ask your travel questions on the Germany Travel Forum