In a never-ending string of mis-steps showing that Barack Obama isn't ready to be President, he has chosen to give a major campaign speech at a monument set up by Hitler to symbolize German dominance over Europe, a monument that celebrated Prussian victories over other European countries.
From "Is Obama Speech Site Contaminated by Nazi Past?":
Still, even as the issue of his speech's location has now been settled, a number of politicians in Berlin are still dissatisfied with the site. The Siegessäule -- or Victory Column -- was erected in memory of Prussia's victories over Denmark (1864), Austria (1866) and France (1870/71). The column originally stood in front of the Reichstag, Germany's parliament building, but was moved by Adolf Hitler to its current location in 1939 to make way for his planned transformation of Berlin into the Nazi capital "Germania."
"The Siegessäule in Berlin was moved to where it is now by Adolf Hitler. He saw it as a symbol of German superiority and of the victorious wars against Denmark, Austria and France," the deputy leader of the Free Democrats, Rainer Brüderle, told Bild am Sonntag.
Obama previously was going to campaign at the Bradenburg gate, forcing the German Chancellor Angela Merkel to "dissuade" him (another of Obama's many acts which put our allies in a bad situation). Apparently he didn't think it important to actually LEARN the history of the countries he is visiting.