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Hadrian's Wall (Latin: Vallum Hadriani) is a stone and turf fortification built by the Roman Empire in northern England to stop attacks by Scottish tribes. There were three legions working on it and in 10 years it was nearly finished.
It was made a UNESCO World Heritage Site in 1987. English Heritage, a government quango in charge of managing the historic environment of England, describes it as "one of the towering achievements of military engineering, and a monument to the power of one of the greatest empires in world history".
The Vallum is a huge earthwork associated with Hadrian's Wall. Unique on any Roman frontier, it runs from coast to coast to the south of the wall.
The original wall was 20 feet tall and 8 feet wide. It had a fort every 7 miles that housed a force of over 500 soldiers and for each mile there were smaller forts and watchtowers.
The wall was the most heavily fortified border in the Empire. In addition to its role as a military fortification, it is thought that many of the gates through the wall would have served as customs posts to allow trade and levy taxation.
A significant portion of the wall still exists, particularly the midsection, and for much of its length the wall can be followed on foot by Hadrian's Wall Path or by cycle on National Cycle Route 72.
"Stretching for 73 miles across northern England, Hadrian's Wall is the most important monument of Roman Britain, and the best-known frontier of the entire Roman empire".
- List of World Heritage Sites of the United Kingdom
- Antonine Wall
- Frontiers of the Roman Empire
- UNESCO, "Frontiers of the Roman Empire"; retrieved 2012-4-19.
- English Heritage. An archaeological map of Hadrian's Wall
- English Nature. Hadrian's Wall – Red Guide. 
- Hadrian's Wall.org
- Hadrian's Wall National Trail Path
- UNESCO Frontiers of the Roman Empire
- Hadrian's Wall & Housesteads Fort information at the National Trust
- News on the Wall path