For two thousand years the Silk Road was a thoroughfare for the transmission of merchandise, knowledge and religions. It started from Changan (the present Xian), crossed Western Asia and reached Africa and Europe, connecting ancient China to the Roman Empire in the Western world. In the late 1800s a German geologist Richthofen named the route Silk Road, reflecting its primary use at the time. With centuries of development the Silk Road, exemplifying exchanges between civilizations and natural sights, has attracted countless visitors.