I found this documentary where you can watch David Lee Hoffman in some of the most remote regions of China in search of the finest, handmade teas in the world.
Mr Hoffman has been travelling around Asia for more then 40years trying to find the most rare and pure Teas. You can read more about him and his work on: http://thephoenixcollection.com/about.htm
Here is the video:
Happy Tea Break,