The Friday Mosque at Isfahan features a large vaulted chamber called a(n) set within a rectangular frame.

Iwan.

Explanation:

This is a vault in the great Iranian mosque which is situated in the Isfahan province of Iran. It is today seen as one of their heritage to especially the locals of the province. It is seen to have a lot of visitors more especially tourist because of it architectural design and make. Withstanding the war that occurred in the city in the later times and also being one of the greatest centre of worship to muslims in the province and Iran as a whole.

answer; statuesque figures that cast shadows);