I have always been fascinated by these places. There are some great ones in Prague. There is a great one near Moszkva Tér at Városmajor. There is a good one if you look at the Pest bank of the Danube from the Margaret bridge. But today, in Sarajevo, I found a Mosque as such. It was quite exciting to see. (I saw some other great modern ones as well. One looked distinctly Bauhaus. But no pic. Sorry.)