I recently visited Warszawa. And Berlin a few weeks before. And it was great to see, that the (good) relations and history between our neighbour-countries are topic of public exhibitions in both cities.
In Berlin in the Paul-Löbe-Haus near the Reichstag: http://osm.org/go/0MbFDIgnY?m=&node=1619235770
In Warszawa around here: http://osm.org/go/0Oy6U9RdJ–?m=&relation=2907540