Berlin is a thriving city, frozen in time for 50 years, and rejuvenated with a young population in the last 15 years. There’s a lot to see that’s connected with the war and the immediate post war period. The former Stasi offices, East Side Gallery which is pictures painted of remains of the wall, Bernauer Strasse which straddled the wall, Brandenburg Gate, Jewish Museum, Jewish Memorial, Fernsehturm in Alexander Platz from which you get a good panoramic view of the city. If you book ahead you can walk around the Reichtag. The Technical museum is interesting if you like ships and planes, and there’s a long list of museums on Museum Island. Further afield the Charlottenburg Palace, Tempelhof airfield where they some times run tours of the Nazi era terminal building, and Sachsenhausen concentration camp.