South Australian Museum
This museum's Aboriginal Cultures Gallery houses the largest collection of Indigenous Australian cultural material in the world. Old black-and-white films show traditional dancing, and touch screens convey a sense of desert life. Also in the museum are an exhibit commemorating renowned Antarctic explorer Sir Douglas Mawson, after whom Australia's main Antarctic research station is named; an Opal Fossils Gallery housing the world's most expensive opal collection and the fantastic opalized partial skeleton of a 19-foot-long plesiosaur; and a biodiversity gallery. There's also a café overlooking a grassy lawn. If you are traveling during local school holidays, there are fantastic interactive craft and education activities for children for a small fee.