There are many places to visit in Cologne, and many of the attractions in Cologne are marked by World War II. In fact, it's widely known for the destruction of its historical center and its impressive post-war buildings
Nevertheless, the city has many parks, monuments, and emblematic buildings. Possibly one of the best places to see in Cologne is the Cathedral, a historical neo-gothic building located in the city center. Inside there is the Shrine of the Three Kings, where it is claimed that the remains of the Three Kings lay, having been transported from the Cathedral of Milan in 1164.
Another one of the things to do in Cologne is to walk along the Hohenzollern Bridge or Hohenzollernbrcke. It's located on the Rhine and as a railway bridge it sees the most traffic in Europe. Rheinparkes is a park, and is one of the most popular things to see in Cologne. It's situated on the right bank of the river and is known for its uniqueness and for being one of the most visited parks in of all Germany.
If you love museums, then you'll find a lot of stuff to do in Cologne as there are numerous museums throughout the city. The most remarkable are the Romano-Germanic Museum, which contains archaeological findings and Roman tools, and the Imhoff-Stollwerck Museum, which is also known as the Cologne Chocolate Museum. There are several Cologne activities and Cologne attractions that are essential, but you also have to enjoy its culture, its people and, especially, its beer. For more on what to do in Cologne, browse through the many firsthand experiences shared by minube users.