Has anyone been there? Actually seen the Potala Palace? Taken the new train that has tracks on permafrost? NBC had an article about this train in its "China Rising" series. I looked it up online and it's very interesting. Relatively cheap too. I'm a little concerned about the fragile environment, however. Anyway, this thread is not about global warming or politics, so I'd be grateful for touristy posts.

http://www.chinatibettrain.com/