Built in the 15th centry , this complex is a world-famous monument and the greatest attraction of Zanjan province . Sultanieh district in which the complex is situated , is at a distance of 43 km from Tehran-Zanjan highway.
Dating back to circa 3000 years ago , Sultanieh district had been the home of various peoples before the invasion of Iran by the Mongols.
The most significant part of the said complex is Gonbad-e-Sultanieh.It is the biggest dome in Iran and one of the most splendid buildings throughout the Islamic world.
The construction of such a magnificently impressive building, undoubtedly, needed elaborate planning and accurate calculations.