Free to tour, the Cologne Cathedral is a must-visit while in Cologne. The size alone will take your…read morebreath away. Looking closer at all of the details, it's truly amazing. You could just stare for hours.
The inside can be overwhelming, walking amongst crowds of people. The interior takes 30 minutes or so to check everything out. There is so much to look at and take in.
Admission is free but keep in mind to be sober and dressed decently modest. We did watch people be turned away.