Silk Road Documentaries

There are lots of people knowing Silk Road in the world, particularly Japanese and German, but it is hard to tell the detailed history, geography, culture, human etc. about it. Some excellent documentary movies that can help you understand the cultural and stunning Silk Road on the human history.
Silk Road made by NHK and China in 1980, this is early version for the Silk Road. Later on, NHK made more documentary about the Silk Road, apparaently Japanese are very interested for the Silk Road.
Hexi Corridor was made by CCTV in 2015, which tells the history and stories that happen in the Hexi Corridor.
Dunhuang is an excellent ducomentary that was made byu China Central Television in 2010. The series have 10 episodes telling the stories that happened in the past 2000 years in Dunhuang area on the Silk Road. Moreover it displays the achievements of the Dunhuang study.