The Great Wall stretches from Shanhaiguan in the east, to Lop Lake in the west, along an arc that roughly delineates the southern edge of Inner Mongolia. The most comprehensive archaeological survey, using advanced technologies, has concluded that all the walls measure 8,851.8 km.
The Silk Road is a great East to West trade route and vehicle for cross-culture exchange started in the second century BC. It was first traveled by the adventure of Zhang Qian started the journey to the far West for the political contact with Yuezhi, a nomadic tribe, in 138 BC.