The northernmost point of Hadrian's Wall in northern England, representing the most northerly extent of the Roman Empire outside the periods when the Antonine Wall was occupied. Notable for its unfinished wall ditch, which was never completed because the volcanic quartz-dolerite whinstone proved too hard for Roman tools to cut through, offering rare insight into Roman construction methods and limitations. The site includes a nearly square Roman temporary camp measuring approximately 47-50 metres per side with four gated entrances protected by external titulum earthworks. Evidence of interior building foundations suggests occupation across multiple campaign seasons. The site of Milecastle 30 is also located here, along with a modern trig point.
Limestone Corner

| Type | Wall |
|---|---|
| Period | 1 - 500 AD |
| Country | England |
| Coordinates | 55.0388° N, 2.1945° W |
England