To connect worlds, one had to protect them. The Han emperors understood this, and the Great Wall was built over 11,000 ...

Earliest records show a spoon shaped compass made of lodestone or magnetite ore, referred to as a "South-pointer" dating back to sometime during the Han Dynasty (2nd century ... to determine the best ...

In 121 BC, Han Dynasty emperor Liu Che sent General Huo Qubing to the ... to Lhasa (in today's Xizang autonomous region). It was a location that had to be passed, both on the Silk Road as well as on ...