Jameh Mosque of Nain was constructed during Buyid dynasty, and is one of the few mosques that has undergone less changes and has kept its original form. Due to the fact that the Jameh Mosque is located in the desert region, most of the materials used in its construction are bricks and mudbricks. It is one of the oldest mosques in Iran and its architecture belongs to the early Islamic centuries. The main entrance of the mosque is located in the northeastern part of the courtyard called Sahn, and another entrance is located in the southeast of the mosque. The central courtyard of the mosque is not large and is built in the shape of a quadrangle. The eastern, southern and western sides of the courtyard features columns (Chehel Sotoun) that overlook it. The columns have simple brick decorations, but during later renovations some parts were covered with simple plaster. The buildings on the north side of the courtyard are slightly higher and consist of small porches which are decorated with simple bricks. The minaret of Jameh Mosque, made of brick, is located on the southeast corner of the main courtyard, and is about 28 meters high. The architecture of the minaret varies greatly from the architecture of the Seljuk dynasty minarets in Isfahan. There is a vast Shabestan, an underground space usually found in traditional mosques, with pillars made of natural clay. The Shabestan was used during hot days of summer and features two entrances separated by a staircase from the courtyard. The Altar with beautiful plaster works is located in the west Chehel Sotoun.
