This is one of the oldest mosques still standing in Iran, and it was built in the four-iwan architectural style, placing four gates face to face. An iwan is a vaulted open room. The qibla iwan on the southern side of the mosque was vaulted with muqarnas during the 13th century. Muqarnas are niche-like cells.
Huge Bathhouse. With separate quarters for men and women, as required by the tradition, the 1,000 sq meter Qajar Bath House is further divided into 3 main sections. The main door on the southern face leads to a winding staircase ending down at the first section called (Sarbineh).