If you stumble upon the Augarten or go to the aquarium (Haus der Meer), you will also stumble upon a very stark reminder of Vienna, and Austria’s, past. From playgrounds and beautiful gardens throughout Vienna rise three pairs of Nazi Flak Towers, their rough edifices in complete dissonance with the Vienna you’ve already seen. It’s important though, to remember what happened in the 1930s and 40s, from a gradual deterioration of basic rights to outright murder. The names of those who were taken from their homes, as well as their final known destination (mostly concentration camps) can be seen in the bronze plaques embedded in sidewalks. Especially heartbreaking are the plaques where entire families are listed, children and all. So, if your kids can handle it, pay your respects at one of the Jewish museums in Vienna.