This mausoleum, in full Sokullu Mehmet Pasha türbesi, is part of a small complex, it was built by Sinan in 1572. The interior has some fine stained glass windows (some well-made later imitations). The tomb part is connected by a little colonnade to a dershane (classroom) which is part of the medrese that also forms part of the complex. In 2015 that part was being restored. I hope to find more of this complex opened at some later occasion.