A fortified wall in northern China, extending some 2,400 km (1,500 miles) from Gansu province to the Yellow Sea north of Beijing. It was first built c.210 BC, as a protection against nomad invaders. The present wall dates from the Ming dynasty.
A fortified wall in northern China, extending some 1,500 miles (2,400 km) from Kansu province to the Yellow Sea north of Beijing. It was first built c.210 BC, as a protection against nomad invaders. The present wall dates from the Ming dynasty.