Masjed-e Jameh (Jameh Mosque; 8am-5pm, closed for Fri prayers in summer). The initial construction of Jame Mosque dates back to the 8th Century CE, but the whole of the complex has been constructed incrementally. The oldest sections of Friday Mosque date from the Abbasid period (X century). This is one of the oldest mosques in Iran, its magnificent plasterwork over the niche, the marvellous brickwork around the yard, and its silent basement—which may have been used as a fire temple before the mosque was built here—are only a few of the remarkable features of this mosque.
This mosque has no Iwan and dome as do the other famous mosques in Esfahan and Yazd. A 28 m tall octagonal minaret was added to the mosque almost 700 years ago. If you stand in the middle of the yard, you will find yourself surrounded by fourteen columns, each one adorned with a unique and intricate pattern of brickwork.
You might also be interested in the alabaster stonework which reflects sunlight throughout the basement.
It is a hypostyle mosque, with a courtyard surrounded by porticos but with no iwan. The columns of the porticos are rather squat and set close together, but their rich stucco decoration, and that of the mehrab, hides a certain structural heaviness. This X-century stucco decoration at Nain is still in exceptional condition and is renowned for the great variety of its geometric and floral motifs as well as the quality of its calligraphic inscriptions. The wooden membar to the right of the mehrab is XIV century.
One of the most exquisite pieces of artwork inside the mosque is the wooden marquetry pulpit (Persian: menbar). The carpenter matched the wooden parts together like a pieces of a puzzle. The pulpit is decorated with organic geometrical designs. According to the wooden inscription on the left side of the pulpit, it was created about 700 years ago.
An underground water channel runs underneath the mosque. There is a stairway that connects the mosque to the water channel and to chambers above the pool. In the past, people used the water for ablutions before prayers.
The basement used to be a prayer chamber in hot summers and cold winters. The temperature in the basement is always moderate, never varying more than 10 to 15 degrees. The basement wasn’t actually built; it was dug into the ground, which means no materials were used to construct it.
From the mosque entrance you can see the ruined Narin Castle, the town's oldest structure.