The survival of the walls and gates shows that the Roman street pattern survived, at least in part, inside the fortress. Certainly excavations beneath York Minster have shown that the great hall of the Roman headquarters building still stood and was used until the 9th century.
The survival of the fort's structures implies that certain aspects of the Roman street layout were maintained within the fortress. Excavations beneath York Minster have indicated that the main hall of the Roman headquarters building remained standing and was in use until the 9th century.