Birdoswald stands on a bluff above the River Irthing in Cumbria, almost at the point where Hadrian's Wall leaves the flatter country near Carlisle and begins to climb into the harder, wilder ground of Northumberland. The Roman fort here was called Banna, and it was one of the larger forts along the wall, home to a cohort of auxiliary soldiers. What makes it special is that you can walk along a stretch of the wall that stands tall, with the original facing stones and the line of the turrets still visible, and look out over a steep wooded gorge where the Irthing cuts through red sandstone.
The nearest towns are small ones. Brampton is about nine kilometres away and Haltwhistle about the same, both under five thousand people, so there is petrol and a few shops in each, but for supermarkets and bigger fuel stops, Carlisle is the sensible place, about twenty-four kilometres off. The road to the fort is a minor one, narrow in places, so take it gently, and watch for sheep, cattle grids and the occasional tractor.
The riding in this part of the world is a quiet pleasure. The B6318, the Military Road, runs on the line of the old Roman military way along the wall itself in the central sector, but near Birdoswald the roads wander through rolling farmland with hawthorn hedges, small stone bridges, and long views north to the Scottish Borders and south to the North Pennines. Corners are gentle, surfaces vary from good to patched, and the wind can be sharp even in summer. Rain is likely at any time and the Cumbrian light changes quickly.
The wall was begun around AD 122 on the orders of the emperor Hadrian and ran for about eighty Roman miles from the Tyne to the Solway. It was not only a defensive line but a way of controlling movement, taxing trade and showing that Rome had arrived. Soldiers were stationed along it for nearly three centuries, and the fort's story runs into the post-Roman period too, with evidence of timber halls built over the old buildings after the legions left.
If you stop, take time at the visitor centre if it is open, and note that opening times vary with the season and the managing organisation. A walk along the wall to the west is a gentle half hour, and a flask of tea is a sensible thing to carry.