Innenstadt

If you travel solo to any European city, I highly recommend doing one of those free walk tours (free to join but tips are expected). Great way to get to know the city through a local guide and make some new friends who might also be traveling solo. I went on this 2.5-hour Freewalk Cologne Tour and had a cheerful Cologne native as our guide. She was really good and gave a lot of historical stories and personal takes.