the center of the Prague is filled by races from all over the world to stimulate my racial autism. I heard: Chinese, Korean, Vietnamese, Indian languages, German, Russian, Polish, French. But anyway I didn't recognize anyone from America, Central Europe is really far from it in terms of contacts regular tourist.
But its outskirts are real Slavvic Commieborea (I mean it by commie blocks, not real communism). I saw some very large park with blocks in the background (north of Hradčany).