Circle Square

 is an area in Old City.

About four hours prior to John Druitt following Ashley Magnus from the Old City Sanctuary to the eastside warehouse, he first arrives behind a warehouse down near this part of town. While there, Druitt encounters a prostitute. From her, he learns what street the Sanctuary is located on shortly before stabbing her to death.

Dr. Helen Magnus is informed by Henry Foss about the murder and requests to be sent the CCTV footage. During the dialogue exchange, viewers learn the name of this area of Old City.