This natural history and science museum is so impressive in size and scope, it seems to belong to a much bigger city. Spanning five floors, the "House of Nature" has artistically phenomenal dioramas, detailed exhibits on the wildlife and natural phenomena of the alpine region, and a live reptile zoo and aquarium. There are also extensive collections of geological findings from all over the world, including giant alpine crystals. The museum devotes half a floor to Christian Andreas Doppler, a Salzburg mathematician and physicist famous for discovering the shift in frequency known as the Doppler effect. The exhibit shows, with hands-on experiments, how the Doppler effect is used today in radar, medicine, lasers, music, and the like. The other half of the building has three additional floors called the "Science Lab," where children and curious adults can learn and experiment with mechanics, aerodynamics, robotics, and the human body. The ground floor has machines that demonstrate leverage and energy; it's all very hands-on and lots of fun for all ages. One floor has revolving exhibits, and of course there's a room devoted to music and Mozart. Give yourself at least 3 hrs. to truly enjoy your visit here.