Natural History Museum, Vienna

This is a big, old-fashioned collection museum in a building that is itself part of the visit, and it is worth knowing before you go that two things split the family up. The guided roof tour, which takes you out above the rooftops of Vienna, is closed to younger children and is not reachable step-free, so one adult stays downstairs with the small ones while the others go up. And the halls at the far end of the numbered sequence are shut for rebuilding at the moment, so a route planned from an old floor plan will run into a locked door. The Café Restaurant sits under the upper dome and serves Viennese standards, from coffee and cakes to warm dishes, though its kitchen stops serving before the café itself closes. Audioguides are borrowed at the info desk. If you are coming as a school or children’s group rather than as a family, the museum wants you registered in advance.