As world powers realign their cultural, economic and political outlooks, there is no better time to consider how Afro-Eurasia's complex network of ancient trade routes - which spanned the vastness of the steppe, vertiginous mountain ranges, fertile river plains and forbidding deserts across the continents and on to the seas beyond - fostered economic activity and cultural, political and technological communication. From silk to slaves, fashion to music, religion to science the movement of interaction of goods, people and ideas was crucial to the flourishing of peoples and their cultures...