Dome of Soltaniyeh - Zanjan
The dome is located 30 km east of Zanjan inside the rampart of the old city of Soltaniyeh. It is an octagonal building, each side of which is almost 80 meters. The Soltaniyeh Dome is built in the Arg city or old fortification of Sultaniyeh, the capital of Oljaytu, an Ilkhan ruler.