Evidence from Sewingshields suggests that surveyors first laid out a single line of stones to indicate where the wall should be built. Then the turrets and milecastles were started. It is though that work started at Newcastle and progressed westwards but this is open to debate. Inscriptions called centurial stones have been found at regular intervals suggesting that each century was allocated a length of wall to build. The wall was not built exactly the same way for its whole length – local conditions and new ideas had an effect. The core between the front and back stone facings could be of clay, soil and/or stones.
Hadrian's Wall is almost 2000 years old and as a result there are many Hadrian's Wall facts to learn about this historic World Heritage Site. Hadrian\'s Wall Facts Letter: K
