Above is a photo of the Divinity School, the oldest surviving part of the Bodlian Library (I think I have this right, but correct me if I’m wrong). They began building this part of the library early in the 15th century!
Below is a picture of the Radcliffe Camera (a relative latecomer to the august Oxford library system; building was only finished in 1749), which has become a reading room used primarily by undergraduates. Sydney, when we have our own house, I’m expecting something along these lines for our own library. We already have the books–now we just need the edifice!