This may not be for everybody, but if you are interested in the history of photography, or in Buddhist spiritual practice, I rate this one of the most interesting sights in Luang Prabang. The archive here contains photographs going back to the early 20c - some very precious historical documents particularly given the country's traumatic modern history - as well as modern photographs of forest meditation retreats and monastic ceremonies. I was particularly interested to see good coverage of women's spirituality, often overlooked. Not always open, but do try to get to see the exhibit. If you are lucky, and I was, you will find a young curator who was a novice at the time some of the photos were taken and can tell you about Hans Berger's work and the background to the photographs.
I don't usually buy books when I'm travelling. I did buy the books of photographs that are sold here, and reckon them a bargain even though they are not cheap.More