The natural history museum in the beautiful Ottoneum building, originally the first permanent theatre in mainland Europe, has everything you and the kids need to know about dinosaurs, 270-million-year-old fossils, the evolution of mankind, and human-influenced landscapes and their natural inhabitants. The Iguanodon bones and the life-size mammoth steal the show on the first floor; one storey up it's Goethe's elephant (which in 1780 after tragically falling off the Karlsaue cliff became one of the first mounted pachyderm skeletons) and the 18th-century flora collections that fascinate.