https://en.wikipedia.org/wiki/Minar_(Firuzabad)#Description_and_history
The tower-like structure of Terbal was located at the very centre of this circle.
https://en.wikipedia.org/wiki/Firuzabad,_Fars#History
The city had four gates; to the north was the Hormozd Gate, to the south the Ardashir Gate, to the east the Mithra Gate and to the west the Wahram Gate.
https://en.wikipedia.org/wiki/Round_city_of_Baghdad
The circular design of the city was a direct reflection of the traditional Persian Sasanian urban design. The ancient Sasanian city of Gur/Firouzabad is nearly identical in its general circular design, radiating avenues, and the government buildings and temples at the center of the city.
The city had four gates:
Bab al-Kufa ("gate of Kufa"),
Bab al-Sham ("gate of al-Sham or Damascus"),
Bab al-Khorasan ("gate of Khorasan"), and
Bab al-Basra ("gate of Basra").
Now I'm just BABELing..
Confounding languages!
https://en.wikipedia.org/wiki/Khurasan_Road