The Umayyad Mosque
The first ever in the city, built in 640 AD by Utba bin Farqad Al-Salami after he freed Mosul in the reign of Caliph umar ibn Al-Khattab. The only part still extant is the remarkably elaborate brickwork 52 m high minaret that leans like the Tower of Pisa, called Al-Hadba (The Humped).
Read more about this topic: Mosques And Shrines Of Mosul