If you the natural world, then a visit to the Natural History Museum in Milan is a must. The museum is located in the Porta Venezia neighbourhood.
It houses a wide variety of scientific and archaeological displays, including mineralogy, paleontology, zoology and the history of man. There is a unique collection of dioramas with over 100 specimens of plants and animals living together in various ecosystems. It's an interesting museum if you love the natural world. If you are coming to Milan with kids, this place is an amazing place for them.
The museum is open from Tuesday to Sunday from 10 am to 5 pm and the ticket is €5.