The Walker is a really impressive gallery, with a collection that takes in a fantastic copy of Holbein's portrait of Henry VIII and other terrific pieces by Rembrandt, Millais, Rossett and Waterhouse, as well as slightly less impressive pieces by the likes of Degas and Monet. There's also a brilliant sculpture room and a really striking series of modern art in a side wing. Free entry and a beautiful building – though give the cafe a miss.