1. Eurasian Steppes https://en.wikipedia.org/wiki/Eurasian_Steppe#/media/File:Eurasian_steppe_belt.jpg
2. Main Silk or Spice Routes between 500 BCE and 500 CE https://www.ancient.eu/uploads/images/8327.jpg?v=1521123900
3. Achaemenid (Persian) Empire 500 BCE https://upload.wikimed, 550 BCEia.org/wikipedia/commons/5/56/Map_of_the_Achaemenid_Empire.jpg
4. Alexander the Great’s Empire, 323 BCE https://upload.wikimedia.org/wikipedia/commons/c/cf/East-Hem_323bc.jpg
5. Eurasia in 300 BCE, after break-up of Alexander’s Empire https://www.horsenomads.info/images/maps/full/Map-15-300-BC.jpg
6. Central Asia, Year 1 CE https://upload.wikimedia.org/wikipedia/commons/7/7c/Asia_001ad.jpg
7. Han Dynasty, 202 BCE to 220 CE https://www2.kenyon.edu/Depts/Religion/Fac/Adler/Asia201/Maps/Han%20Empire.jpg
8. Sui and Tang Dynasties, AD 581-907 http://www.classzone.com/cz/books/ms_wh_survey/resources/images/chapter_maps/wh14_suitang.jpg
9. Tarim Basin and Modern States https://en.wikipedia.org/wiki/Tarim_Basin#/media/File:Tarimrivermap.png
10. The Travel Routes of Faxian, Xuanzang and Yijing http://afe.easia.columbia.edu/special/travel_records.pdf