The Great (Nuriddin) Mosque
Built by Nuriddin Zanki in 1172 AD next door to the Umayyad Mosque. Ibn Battuta (the great Tunisian traveller) found a marble fountain there and a mihrab (the niche that indicates the direction of Mecca) with a Kufic inscription.
Read more about this topic: Mosques And Shrines Of Mosul