I haven't posted one of these for a while. Seabegs Wood is not normally at the top of the list of Antonine Wall sites, but it has its own charms. Although there is a fortlet that was excavated in 1977, nothing is discernable above ground. Aside from the usual militaria, pottery and gaming balls have been found, but no inscriptions or even coins have turned up. Here is the description from L. J. F. Keppie, J. J. Walker, "Fortlets on the Antonine Wall at Seabegs Wood, Kinneil and Cleddans," Britannia 12 (1981), p144.
The fortlet faced NW, with wide views over the Denny Gap and the upper reaches
of the Bonny Water. It measured internally 21-8 m N-S by 18 m E-W, with a rampart of turf laid on a stone base 2-8 m wide. The Antonine Wall itself, having detoured to the N to take in the plateau, formed the N rampart of the fortlet, but the width of its stone base could not be determined, as ploughing had removed the N kerb and parts of the core; the most probable width would be 4-3 m, a dimension recorded during excavation in the Wood itself.
But the site is noteworthy for two distinct reasons. First and foremost, the Wall itself is rather well-preserved (more pictures can be seen here). And second, and for my money much more interesting, the military road, essentially the main highway that ran parallel to the Wall, is very clear indeed. Put aside any thoughts of a single track dirt track, this was a multi-lane motorway.
The photograph is taken standing on the wall looking down at the ditch on the right.
The size of the military road - in the middle of the picture - is clear.