Ardistān, congregational mosque, located in central Iran, is one of the earliest examples of a mosque with four īwāns (vaulted halls walled on three sides, with one end entirely open; see Figs. 19 and 20). The mosque is part of a large complex of public buildings that include a mosque, a madrasa (school or seminary), public baths, a Ḥusayniyya (a place where Imam Ḥusayn is commemorated), a cistern, a caravansarai and a …