Mezquita Rustem Pasha - Rüstem Paşa Cami

In two or three guides, including the Internet one, I read that the most beautiful mosque in Istanbul was the Rustem Pasha and this is true. It was the Sultan Suleiman Pasha's and a mosque was built next to the Galata bridge in the Horn of Gold. From the outside it looks like any of mosques in Istanbul, and the entrance is through a ground floor, but it is the most beautiful and elegant in Istanbul. The Blue Mosque is popular, but this one is pretty blue and beautiful.