The ancient city of Ctesiphon, on the banks of Tigris, is located southeast of modern Baghdad. Established in the late 120s BC, it was one of the great cities of late ancient Mesopotamia and the largest city in the world from 570 AD, until its fall in 637 AD.
The only surviving structure of Ctesiphon today is the majestic vaulted hall of Taq Kasra, which served as the palace of the Sasanian king Khosrow I, in the late 6th century. The archway is one of the largest single-span vault of unreinforced brickwork in the world.
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