Soltaniyeh is one of the cities of Zanjan Province, located 43 kilometers from Zanjan City. Dome of Soltaniyeh and Öljaitü Tomb are in this city. Molla Hassan Kashi tomb and khanqah of حسام الدن حسن چلبیare other historical monuments of this city.
Dome of Soltaniyeh is the tomb of Öljaitü which was constructed from 1302 to 1312 AD in Soltaniyeh City (Ilkhanid capital) and it is considered as an important Iranian Islamic architecture and Azeri style architecture.
Dome of Soltaniyeh is one of the most important examples of Ilkhanid architecture that has had a great effect in historical monuments architecture in the world; we can see this influence in the architecture of Cathedral of Saint Mary of the Flowers in Florence.
After Dome of Cathedral of Saint Mary of the Flowers in Italy and Dome of Hagia Sophia in Turkey, Dome of Soltaniyeh is the third largest dome in the world.
The dome registered in Iran's National Heritage in 1931. It was also registered in the list of UNESCO world Heritage as the seventh Iranian classic in Tir 24th, 2005.