Hi,
How many days will you be in Berlin? For the entire day 12 days? On the history and war related sites, that depends on how deep is your interest level. There are numerous sites in Berlin connected with the war history....cemeteries, museums, memorial plaques, Start with the German History Museum (DHM) on Unter den Linden.
For WW2 I heartily suggest going Seelow since you already are in Berlin. Take the regional train to Frankfurt an der Oder, then transfer to the S-Bahn. The Seelow Battlefield Memorial and Museum focuses on the horrific battle for Berlin which began as the Soviets tried to break across the Oder.
Notice that streets in Berlin are named after historical personalities, poets, philosophers, politicians, scientists, military figures, etc. (such as Grolmannstrasse, Tresckowstrasse, Hardenbergstrasse, Knesebeckstrasse, Kleiststrasse, Scharnhorststrasse, Clausewitzstrasse, Lutzowstrasse, Kluckstrasse, and on and on.