This free trip to Germany is mainly around Frankfurt due to the lack of time. It is also very convenient to come to Cologne from Frankfurt, and you can reach Cologne Station by train directly. Cologne Cathedral is near the central railway station of Cologne, and you can see this magnificent church building from the station. Cologne Cathedral is the largest church in Germany and is a landmark building in Cologne. It is known for its lightness and elegance, and it is the most perfect Gothic building in the world. It is also called the three major religious buildings in Europe, alongside Notre Dame Cathedral and St. Peter's Cathedral in Rome. It is free to visit inside the church. If you want to climb the top, you need to buy tickets, adults 5€, go up the spiral staircase, you need to walk 533 stairs, about 15 minutes to climb the top.