This museum conducts activities whose aim is to promote a greater awareness of the diversity of the natural world. It has over 6 million specimens in its collections, and this makes it one of the main reference centres for not only Spanish fauna, but also that of other Mediterranean areas. It also has interesting permanent exhibits, such as the one devoted to the history of the earth and life, in which spectacular specimens can be viewed, such as the replica of a Diplodocus; the Stone Garden, an open-air ensemble of rocks and petrified tree trunks; Mediterranean, nature and civilisation, in which the ecosystems and fauna of this area are shown; and the Royal Museum, which offers a journey back through time via collections with centuries of history.