Cologne Cathedral is a must-visit place for Cologne tourism. The interior of the church itself is a treasure house. Since the church construction took more than 600 years, spanning more than six centuries, during this period, the painting style and exquisiteness of religious works have changed greatly. It is located in the church. You can see many different styles of works, murals, reliefs, holy statues, etc. can be seen, slowly appreciate you can feel a very heavy sense of history.