The greatest brick dome of the world, and the first two-layered dome of Iran, the majestic Soltaniyeh Dome was constructed according to an order by Soltān Mohammad Khodābande, the Ilkhanid King of Iran, in the period between the years 703-713 AH. The site proves as a prominent achievement by Iranian architects, and functions as a key to the development of the Islamic Period architecture. The Dome manifests as an octagonal building, surrounded by eight minarets. Fifty meters high, and 27 meters wide, the Soltaniyeh Dome stands on top.