Hadrian’s Wall was buit by the order of the emperor Hadrian, following his visit to Britain in AD 122. It was planned as a continuous wall with a milecastle every Roman mile (1.48 km) and two turrets equally spaced between each milecastle. The wall, with its defensive ditches and large forts, stretched from coast to coast, a distance of 80 Roman miles (approximately 120 km or 75 miles). It formed the northernmost frontier of the Roman empire. Hadrian’s Wall is a World Heritage Site, designated by UNESCO.
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