Forty kilometers to the City of Zanjan lies Gonbad-e Soltaniyeh,the mausoleum of ll-Khan ruler Oljeitu. The brick structure was created in mind –fourteenth century in ll-Khan capital city of Soltaniyeh. This is the world’s highest brick
dome.The dome is 50 meters high and its octagonal base is 25 meters wide. An interesting feature of the compound is ten thousand square meters of plaster-work and painting.
A Wide array of ornamental works such as plaster-work,tile-work,painting on plaster and mosaic would meet the eye. Soltaniyeh is one of the world’s highest domes,along with Santa Maria dei Frari Church in Venice and Hagia Sophia
Cathedral is Istanbul.