Soltaniyeh Dome is a mausoleum in northwestern Iran that exemplifies early 14th-century Ilkhanid architectural innovation. Constructed between 1305 and 1313 for Oljaytu, a ruler of the Mongol Ilkhanid dynasty, the structure represents a watershed moment in Islamic dome engineering. Soltaniyeh was inscribed as a UNESCO World Heritage Site in 2005 ...