Museums are very underrated when it comes to taking pictures.
Not that there are never pictures taken in a museum, in that respect they are one of the most popular places to take pictures. But in photography circles (not that I consider myself to be in anyway a professional/real photographer), there seem to be a common belief that nothing original, wonderfully odd or awe inspiring can be captured when a 2,000 year old piece of bronze or stone is the subject. People are an entirely different matter however. The faces one makes when viewing history are most certainly worth being captured. People watching, as any photographer knows, makes for excellent subject matter.
But that's beside the point
I believe museums are wonderful places for photographic oddities. I do have a thing for shadows, and museums have great relief lighting, so that could be part of it. But in my opinion, there really is nothing quite like a calm stroll through a large hall, searching out moments to snap.