Milecastle 5 (Quarry House) was the first milecastle west of Pons Aelius fort of the RomanHadrian's Wall. No remains exist of the milecastle, though its supposed position is at the junction of the A186 Westgate road and the B1311 Corporation Street.[1] No remains currently exist.[2]
It is probable there was a Mile Castle where the Wall makes a bend at the top of Westgate Road
1968 - English Heritage Field Investigation. It was noted that all traces of the Milecastle had been obliterated by modern development.
Associated turrets
Each milecastle on Hadrian's Wall had two associated turret structures. These turrets were positioned approximately one-third and two-thirds of a Roman mile to the west of the Milecastle, and would probably have been manned by part of the milecastle's garrison. The turrets associated with Milecastle 5 are known as Turret 5A and Turret 5B.