The Silk Road
The ancient network of trade routes that converged to connect the ancient Eastern and Western worlds provided the very first examples of globalization. The ideas and wealth that spread along the Silk Road transformed civilizations and cultures across Afro-Eurasia.
All manner of Silk Road tours are offered in China. Some will take you from Kashgar to Xi'an, while others will cover a smaller portion of the old trade network sites. More adventurous travelers look to backpack the road on their own, though there are difficulties navigating China's transportation network out west due to the lack of English speakers and signs.