Mei Zhang grew up amid the emerald-cloaked mountains of Yunnan, China, where an old joke mentions that the gorges were so narrow, and their slopes so steep, that you could shout across the valleys to ...

The traces of ancient roads survive across the globe, revealing how connections were forged from region to region and country to country. Some routes persist only as memories; some have been preserved ...

Add Yahoo as a preferred source to see more of our stories on Google. “The mountains and the trails shaped the way people lived,” recalls Zhang, a National Geographic Explorer and founder of the ...