Saturday fun activity: Where IS this?

      It's Ramadan, the ninth month of the Islamic calendar, a time of dawn-to-dusk fasting. Observing the fast is considered one of the "Five Pillars of Islam," but it's also a time of celebration and renewal of community ties, particularly at the Iftar, the post sun-down meal. Friday night I attended an Iftar raising money for the Palestinian Children's Relief Fund  at Reza's on Ontario, a very nice group of Chicagoans, and of course plenty of good food as well. It was a lot of fun, and if you the chance to attend an Iftar—Ramadan runs until July 28—I suggest you grab it.
      This photo was taken, not at the Iftar, but inside a mosque, obviously, but which one? My supply of posters is almost gone, so the winner will receive a signed copy of my recent book, "You Were Never in Chicago." Please be sure to post your guesses in the comments below. Good luck.