Return to the previous picture in slideshow. The Süleymaniye Mosque. This is located in the historic quarter of Istanbul. Süleymaniye mosque was built in the 16th century and is considered to be the most beautiful of the imperial mosques in Istanbul. It includes 6 madrasas, many functional structures and the mausoleums of Süleyman I and the Sultana Hürrem Sultan. It was completed in a comparatively short time between 1550 and 1557 which illusturates, beyond all else, the might and organisation of the Ottoman state at the time. Proceed to the next picture in slideshow.