Hadrian's Wall is the largest, most spectacular historical monument in Britain. Nothing else approaches its vast scale: a land wall running 73 miles from east to west and a sea wall stretching at least 26 miles down the Cumbrian coast. Some of its forts are as large as Britain's most formidable medieval castles, and with its mile towers, barracks and soldier's leisure facilities, the site allows an astonishingly rich insight into Roman frontier life. Hadrian's Wall Operations Manual looks at the design and construction of the wall, from the initial land survey to its busiest period as Rome's most northern frontier.