Not every stretch of Hadrian's Wall is the dramatic crag-top masonry of the postcards, and this is one of the quieter parts: a section of the vallum, the great ditch-and-mound earthwork the Romans dug behind the wall, running across farmland near Brampton in Cumbria. The stone wall here was largely robbed out long ago for farms and churches, so what survives is often a long, soft hollow in the grass, a line you only notice once someone points it out, and then can't stop seeing.
The vallum is something of a puzzle. Built just south of the wall in the 120s, it was a flat-bottomed ditch about six metres wide flanked by banks, and it seems to have marked the rear edge of a military zone, controlling who could approach the wall from the Roman side. Crossings were only at the forts. Grazing sheep, field walls and a few centuries of ploughing have softened it, but in low evening light the shadows bring the line out across the fields.
For riders this is lovely country. The Irthing valley and the hills towards Gilsland roll gently, with narrow lanes between drystone walls and hedges, short steep climbs and blind crests that demand some respect. Watch for gravel washed onto bends, mud from tractors, and sheep who regard the road as theirs. A few miles east, Lanercost Priory, founded in the twelfth century and partly built from Roman stone, makes a superb stop, and Birdoswald fort beyond it shows you what one of the wall's garrisons looked like.
Brampton is a small market town with an octagonal Moot Hall in the square, a couple of cafes, pubs and a fuel station; Edward I's sick body rested nearby on his last campaign against the Scots in 1307. Carlisle, about twelve miles west, has everything else, from bike shops to the castle and cathedral. Weather here comes in from the west and changes quickly, so even on a bright day keep waterproofs handy. On a fine evening, though, with the Pennines purple to the south and the Scottish hills hazy to the north, it is hard to imagine a nicer place to be on a bike.