The Roman Walls of Lugo (Spanish, Galician: Muralla Romana de Lugo) were constructed in the 3rd centuryAD. The walls were created as late Roman Empirefortifications. They are still largely intact today. They stretch over 2 kilometres (1.2 mi) around the historic centre of Lugo in Galicia (Spain). Located on a hilltop the walls have a wide ditch directly in front of them. The walls average about 10 metres (33 ft) in height and are up to 8 metres (26 ft) thick. At the front of the wall there are a series of semicirculartowers up to 13 metres (43 ft) in diameter. The walls are constructed of schist from the local area. The walls have been declared a World Heritage site.