What is the sacred city of Lamaism?

A movie/documentary called Chariots of the Gods references them to be known as the Kansur (spelling unknown). It says that there are thousands of volumes, but only 1/100th have been deciferred. I have not been able to find anything on the internet about it though. This movie was released in 1972.

edit:

https://en.wikipedia.org/wiki/Kangyur