This is either a milling interpretive center or some sort of museum or gallery. Its shell is very old and decayed but they put a new glass and steel building inside it. The most popular photo is a view from the river in the evening
Can you be more precise? Have you any idea where this mill is? In the United Kingdom, or in the United States, or somewhere else? The first thing that comes to my mind is the Louvre museum, in France, but I don't think you're talking about that. There is also the Crystal Palace, which used to be in Hyde Park, London. It was first built for the 1851 World Fair. I suggest you visit the Wikipedia article for a few pictures.
