The Rüstem Paşa Camii
Built on a steep hill in the middle of a busy market area, the Rüstem Paşa mosque is yet another masterpiece from the ubiquitous master architect Mimar Sinan. If you weren't carefully looking for the entrance, you would almost certainly miss it: just a narrow set of nondescript stairs leading up from the street. So ascending these steps and emerging into the mosque's spacious courtyard is quite a surprise.
