The most dramatic site of Hadrian's Wall – and the best-preserved Roman fort in the whole country – is at Housesteads, 4 miles north of Bardon Mill on the B6318, and 6.5 miles northeast of Haltwhistle. From here, high on a ridge and covering 2 hectares, you can survey the moors of Northumberland National Park, and the snaking wall, with a sense of awe at the landscape and the aura of the Roman lookouts.
Up to 800 troops were based at Housesteads at any one time. Its remains include an impressive hospital, granaries with a carefully worked out ventilation system and barrack blocks. Most memorable are the spectacularly situated communal flushable latrines. Information boards show what the individual buildings would have looked like in their heyday. There's a scale model of the entire fort in the small museum at the ticket office.