Taq Kasra - Arch of Ctesiphon

Description

Arch of Ctesiphon is located near the city of Salman Pak, middle Iraq. It is the only visible remaining structure of the ancient city of Ctesiphon. The archway is considered a landmark in the history of architecture and is the largest single-span vault of unreinforced brickwork in the world.[Wikipedia](https://en.wikipedia.org/wiki/Taq_Kasra)