Now Mosque with an area of 20,000 m² is the largest mosque in Iran which is located in front of Shah-e Cheragh in Shiraz. It belongs to Atabakan Period which is constructed in 590 A.H. the building of this mosque has been first the home of Atabak Sa'd Ibn-e Zangi. When his child was seriously sick, he vowed to demolish his house and build a mosque there if his child's health was restored. His child's health restored and he fulfilled his vow. On the north and south of Now Mosque, there are two high verandas with a height of 30 and 25 meters and on both sides of these verandas, there are 12 short arcs and a wide shabistan[1] is built behind the south veranda. In addition, on east and west sides of the mosque, there is a large porch in the middle and six chambers are built on the sides of this porches. No artistic work is observed in the building of Now Mosque except on the frontal part of big arcs that are adorned with mu'arragh tiles and thuluth calligraphy. Now Mosque has been registered as a national monument of Iran.