Discoveries: Art, Science and Exploration at Two Temple Place (until 27 April) is like a giant cabinet of curiosities. Maps, gizmos and memorabilia are spread across two floors of this glorious high-Victorian building on the Embankment. There are drawings from doomed polar expeditions, bones and teeth of fish from the Woodwardian Collection (see above), early botanical diagrams, hoards of medieval gold, the loot of empire (the Sufi snakes-and-ladders board in ebony and mother-of-pearl is memorable) and John Maynard Keynes’s armchair.