Today's Geo Quiz took us to Istanbul, Turkey. We wanted you to name the magnificent mosque with the six minarets. The answer is the Blue Mosque. The World's Alex Gallafent travelled there to learn more about Turkey's biggest city. He also sampled the vast array of street food available in Istanbul. That includes a tasty dish made from sheep's intestines that might make a tourist squeamish. But locals love it -- and you can hear the love in a popular song by Turkish pop star Mirkelam.