Hadrian's Wall was declared a World Heritage Site in 1987, and in 2005 it became part of the larger "Frontiers of the Roman Empire" World Heritage Site which also includes sites in Germany.
Where did the materials come from to build Hadrian's Wall?
All the materials were sourced locally by the Roman army. Quarries can be found at various pounts along Hadrian's Wall. Lime was also found and prepared as close to the wall as possible.