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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.
The Great Wall is wide enough at the top for five horses or ten men to walk side by side. The Great Wall ranges in height from just a few feet to over 30 feet tall. Since some of the Wall is built on mountain peaks and high ridges, it looks even taller.