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How large was the vaulted iwan hall of the palace at Ctesiphon?

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ziggurat — Iranian art and architecture Ziggurat at Choghā Zanbīl near Susa, Iran.

The vaulted iwan hall of the palace at Ctesiphon, known as the Ṭāq Kisrā, measures 82 feet (25 meters) wide and 121 feet (37 meters) high. This structure is renowned for featuring one of the largest single-span brick arches in the world.12