Engineering · Roman Empire Daily
Starting in 122 AD, the Romans built Hadrian's Wall, about 73 miles of stone and turf across northern Britain.
Deep dive
Studded with forts, milecastles, and turrets, the wall marked the empire's northwestern frontier and controlled movement and trade. Long stretches still stand today.
Source: Scriptores Historiae Augustae, 'Hadrian,' 11; archaeological surveys.
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