Soltaniyeh

The mausoleum of Oljaytu was constructed in 1302–12 in the city of Soltaniyeh, the capital of the Ilkhanid dynasty, which was founded by the Mongols. Situated in the province of Zanjan, Soltaniyeh is one of the outstanding examples of the achievements of Persian architecture and a key monument in the development of its Islamic architecture. The octagonal building is crowned with a 50 m tall dome covered in turquoise-blue faience and surrounded by eight slender minarets. It is the earliest existing example of the double-shelled dome in Iran. The mausoleum’s interior decoration is also outstanding and scholars such as A.U. Pope have described the building as ‘anticipating the Taj Mahal’.
Justification for Inscription
Criterion (ii): The Mausoleum of Oljaytu forms an essential link in the development of the Islamic architecture in central and western Asia, from the classical Seljuk phase into the Timurid period. This is particularly relevant to the double-shell structure and the elaborate use of materials and themes in the decoration.
Criterion (iii): Soltaniyeh as the ancient capital of the Ilkhanid dynasty represents an exceptional testimony to the history of the 13th and 14th centuries.
Criterion (iv): The Mausoleum of Oljaytu represents an outstanding achievement in the development of Persian architecture particularly in the Ilkhanid period, characterized by its innovative engineering structure, spatial proportions, architectural forms and the decorative patterns and techniques.