I love libraries. They are so peaceful and respectful and they are full of the smell of books and the possibility of learning something new or revisiting an old book-friend.
Perhaps they are losing visitors in developed countries these days due to the easy availability of information and books in digital form. But in developing countries they are still a place where people without means can find information, read newspapers, use the internet and borrow books.
Here is the public library in the town where I grew up.
I can recommend a visit to the Trinity College Library if you are ever in Dublin (and also a visit to the Book of Kells when you are there).
Thibaud Poirier is compiling a series of photographs of great libraries. Have a look at them here. He also took the photo of the Trinity library above.