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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.
Â­So how great is the wall? Its reported length is widely disputed and ranges anywhere from a paltry 1,500 miles (2,414 kilometers) to 4,163 miles (6,700 kilometers) [source: Power, National Geographic].