Taq Kasra

On the Tigris plain south of Baghdad stands engineering's ancient high-water mark: Taq Kasra, the great iwan of Sasanian Ctesiphon, its single-span brick vault arcing about twenty-six metres wide and thirty-seven high - the second largest single-span vault of unreinforced brick in the world, raised in the era when Ctesiphon ranked among the world's largest cities and Persia's kings held court beneath exactly this ceiling. The palace around it has returned to earth; the arch remains, partially restored across the last century, improbable and moving in equal measure. Visits from Baghdad pair it with Salman Pak's shrine town on the river's bend.

History

The date of the arch is uncertain: some historians credit it to Shapur I, who ruled from 242 to 272, others to Khosrow I after a campaign of 540. The iwan hall was about 37 m high, 26 m across and 50 m long, the largest free-standing man-made vault until modern times, and it is all that remains above ground of the city that was the main capital of the Parthians and Sasanians for nine centuries (Wikipedia, Taq Kasra).

Highlights

• The great vault - the 26-metre brick span, unmatched since antiquity.
• The facade wing - the surviving blind-arcaded front.
• The scale encounter - standing beneath the kings' ceiling.
• The Tigris bend - the river geography that raised a capital.

When to go

October to April for comfortable weather on the plain; late light warms the brick. Trips are arranged through Baghdad operators.

Good to know

The monument stands alone - context arrives via your guide's telling; conservation works may frame parts of the structure, in the good sense.

Nearby

Baghdad's museums and the Tigris towns.

Key facts