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Housesteads fort© Ruth Riddle / Geograph · CC BY-SA 2.0
The small fortlets spaced every Roman mile along Hadrian's Wall. 4 on the map.
Best-preserved Hadrian's Wall fort in Cumbria.
Cumbria
Milecastle 49 above the Irthing gorge, where a mile-long run of Wall, first turf and then stone, heads west by Birdoswald fort.
The most complete Roman fort on Hadrian's Wall.
Northumberland
Milecastle 48 beside the railway at Gilsland, known locally as the King's Stables, where stone steps up to its rampart still survive.