The Mihrimah Sultan mosque in Edirnekapı (in the Fatih district) is one of two mosques built for the daughter of Süleyman the Magnificent. The other is in Üsküdar, on the Asian side of Istanbul. Both mosques were designed by Mimar Sinan, the master Ottoman architect. Note the large number of windows in this mosque. Read more in this earlier post. The exterior looks like this.