Radcliffe Camera, Oxford

Turn the corner into Radcliffe Square and you'll see why the Camera is one of the most admired buildings in Oxford. This was the first round library to be built in Britain by John Radcliffe, who studied at Oxford and left much of his wealth and all of his medical books to the university. Building work started in 1737, and in 1860 it became part of the Bodleian Library. It is now used as reading rooms and is not open to the public, but the exterior view is more than enough to make this building worth visiting.