With the ongoing debate in the American South about monuments to Confederates and the Confederacy, I have begun to wonder how Germany handled any Nazi monuments that may have survived the war. Obviously I assume they didn't build any after the end of the war like many of the Confederate monuments, but I would still like to know what became of any public Nazi symbols.
Most of them were destroyed. Germany did not really play a part in the removal. The Allied Powers instituted a policy of "Denazification" meant to replace and eliminate all aspects of Nazism, Hitler, etc. This included the trials and removal of Nazi officials. You can find videos online showing the Allies blowing up swastikas. I believe the one I saw was of the one in Nuremberg. The Nuremberg Rally area still partially exists and the Olympiastadion was built by the Nazis, but you won't find really any remnants of Nazism in Germany. In fact, it's illegal for any other purpose than historical purposes. So, you may see remnants of Nazism in museums and such for historical purposes and some of the concentration camps still exist as museums and monuments to the Holocaust, but nearly all public displays of Nazism were eliminated, like all the road signs that prompted it.