Australia has a population of 20 million people who primarily speak English. Its capital is Canberra, and other important cities include Sydney, Melbourne, Brisbane, and Perth. Some of Australia's most iconic landmarks are the Sydney Harbour Bridge, Barrenjoey Lighthouse, and Archibald Fountain. The Australian dollar is the official currency. Kangaroos, koalas, and eucalyptus trees are emblematic of Australia's unique landscapes and wildlife. Famous Australians include actors Russell Crowe, Nicole Kidman, and Cate Blanchett.