I strongly recommend the Pre-Raphaelite exhibition at Tate Britain. Millais' Ophelia, Holman Hunt's Light of the World and Rossetti's The Beloved are just three of the treasures amongst this trove. There are some wonderful William Morris textiles and examples of furniture painted by Burne-Jones. My favourites were three paintings by Burne-Jones telling the story of Perseus and Andromeda. The final in the series is shown above (apologies for poor copy): Perseus shows Andromeda the severed head of the Gorgon Medusa which he holds in his left hand, in the reflection of the water in the well. If she'd looked at the head directly, Andromeda would have been turned to stone by the Gorgon's curse.