Wall Mile 15 [HB 173]
Our journey continues downhill from Harlow Hill, at the edge of a not-very-exciting field. Here the Wall is in stealth mode: the ditch is barely discernible, the curtain wall is under the road, and the Vallum shows up only as a cropmark from the air (under the right conditions). But is the curtain wall really there? We saw that it still existed on Walwick Hill at the beginning of the 20th century and it has been located near Heddon-on-the-wall, as we shall see, but along Wall Mile 15 and at Harlow Hill, where it has been examined by excavation, it has been completely removed (and not necessarily by the original road builders).
Now we have to cross a road, marked by alternating red and white kerb stones; this is the entrance to Albemarle Barracks, the former Ouston airfield. A short jog along a bit of field then we have to cross over another road (the access track to Whitchester farm) and we carry on in another field, this showing definite signs of the remains of the ditch up against the hedge, so much so that it can be a little difficult walking along it in places, since it is a bit like walking along the side of a hill. Troublesome things, ditches.
Milecastle 15 (Whitchester) [HB 173; haiku]
We start to climb gently uphill and arrive, unannounced, at the site of Milecastle 15 (Whitchester). We cannot see it, as most of it is on the other side of the road (or under it), but its position is known, although it has never been excavated.