If you have a thing for architecture, I highly recommend the Bauhausarchiv in Berlin. (and also, the whole Area around it) Its crazy that you discover the most amazing places "by accident" - since we went to the Nordic Embassy for seeing an exhibition and endet up exploring that Building, which is actually a Museum. The Museum itself shows a few signature Pieces from the Bauhaus era, featuring some infamous Freischwinger Chairs and interior Inspiration. If you don't have the money for the entry, just go downstairs, get a coffee and visit the bookstore and, of course, just look at this building. Reflection over reflection is a new perspective, between concrete and glass. Enjoy the Bauhaus Archiv!