Nusretiye Mosque rises on the Tophane waterfront as a single domed cube of pale stone on a high platform, between two tall fluted minarets. Inside, calligraphy is the draw: a great inscription band circles the walls in gilded letters, set down by Mustafa Rakım, the finest hand of the age. The stonework everywhere is late Ottoman Baroque — wavy cornices, S-curved buttresses, oval medallions. Beside the mosque stands the muvakkithane, the timekeeper's little pavilion, carved with shells and scrolls.
Sultan Mahmud II ordered the mosque in the 1820s, on the shore where the empire's cannon foundry once thundered; the old foundry hall still stands next door. Krikor Balyan, first court architect of the Armenian Balyan dynasty, replaced a barracks mosque lost to fire. The name means victory. Restored recently, Nusretiye still works as a place of prayer, holding its corner between the tram, the busy waterfront and the art galleries that fill Tophane today.