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United Kingdom

A remaining section of Hadrian's Wall, England. The wall was a fortification built by the Romans to mark their northern frontier, to prevent raids by Pictish tribes, and to collect customs. Begun in A.D. 122 and largely completed in six years, it was constructed of turf and stone with 80 small fortlets, one for each Roman mile. Eventually 14 to 17 full size forts were added.