Hadrian's Wall, Hexham

The World Heritage Site of Hadrian’s Wall is over 1,800 years old. It stretches 150 miles across the country, crossing Cumbria, Northumberland and Tyne and Wear. It includes the 73 mile-long Hadrian’s Wall and the Cumbrian coastal defences.

At its peak, the wall would have been around 5 metres tall and in some places 3 metres wide. It was built to define the northern limit of the civilized Roman Empire, keeping the ‘barbarians’ of the north at bay.
— Frances MacIntosh, English Heritage