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Hadrian's Wall was 80 Roman miles or 117.5 km (73.0 mi) long; its width and height varied according to the construction materials that were available nearby.
(CNN)Walls between countries are nothing new. The Romans built Hadrian's Wall about 120 years after the birth of Christ to protect the Roman province of Britain from the heathens who lived in what is now Scotland -- people the Romans referred to as barbarians..