Soltaniyeh
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How it came to be
Soltaniyeh, about 240 km from Tehran in north-western Iran, became the capital of the Mongol Ilkhanid dynasty in the 14th century. Arghun made it his summer capital, and his son Oljeitu turned it into the capital of the empire. After Oljeitu's death the city declined.
What survives at its centre is Oljeitu's mausoleum. A dome 50 m high, covered in turquoise-blue faience, sits on an octagonal building ringed by eight slender minarets. It is the earliest surviving double-shelled dome in Iran and became a reference for later domes in the Islamic world.
Much of the exterior decoration has been lost, but tiles, brickwork, stucco and frescoes remain inside. The mausoleum was entered on Iran's national heritage list in 1932, and the site was inscribed in 2005.
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