Illustration
The remains of Milecastle 39 on Hadrian's Wall near Steel Rigg. 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. The turrets associated with Milecastle 39 are known as Turret 39A and Turret 39B.
About the Author

Carole maintains the popular ancient history photo-blog Following Hadrian, where she travels the world in the footsteps of emperor Hadrian.