One of my regrets is that I never visited Berlin when I was based in Germany in the late 1980s; I could have gone but it was a lot of (as we say in the UK,) faff”. There was paperwork, an official military train, travelling in best uniform, uniform inspections, etc. I just assumed that I wouldn’t be in the military forever and I’d go and take a tour. I’d visited various Inner German Border locations and participated in a 3 day border patrol with an Army unit near Helmstedt (Checkpoint Alpha). Then November 1989 happened.
Still not visited Berlin but if I did, I’d be visiting the GDR museums and East Berlin as a priority.