It is a splendid word –famous domed building which was build in early 14^th century. It is located in sultaneih town some 43km far from Zanjan. This monument was constructed by command of a Mongolian ruler named Oljaytu also known as sultan Mohammad Khodabandeh , as his own mausoleum.

The dome is 48.5 meters high and 25.6 meters in diameter and also the world third highest dome proceeded by Italy's Santa Moria Delfiore cathedral in Florence and Turkey's Saint Sufio mosque in Istanbul.