The movie Ninja Assassin was mostly filmed in Berlin in Germany. We may have a sneak preview of the film thanks to the local section of Reuters:
At the beginning of the clip, when the ninjas are chasing Raizo, all ignoring the roundabout traffic, one may recognize the base of the Victory Column, a famous monument in Berlin. Filming has actually mostly taken place on location throughout and in Berlin and in Babelsberg Studios in Postdam.
And at the end of the preview clip, the glimpse of Rain, in the ninja dojo with the flames in background, is quite impressive!