No surprises here. The imposing filigree towers of the gothic cathedral is one of the most common images to pop into mind when you think of Cologne. However, Cologne Cathedral or Kölner Dom is more than just a stunning structure. Since 1164, the cathedral has been the Shrine of the Three Kings. The reliquary is said to contain the bones of the biblical Three Wise Men, and as such, the cathedral is something of a Catholic pilgrimage site today. The beautiful stained-glass windows, the ornate sarcophagi, and the intricate gothic flying buttresses will certainly answer the question ‘why visit Cologne’. Fun fact: While Berlin and Munich are probably the first places that come to mind at the mention of Germany, the most visited site in Germany is the Cologne Cathedral.