The state capitals are Perth, Brisbane, Sydney, Melbourne, Adelaide, and Hobart. The official name is the Commonwealth of Australia; it was established in 1901.
I believe that the most famous Australian building is the Sydney Opera House. It’s major arts centre built on the harbour in Sydney, and a unique example of modern architecture, regarded as the finest modern building in Australia. It was designed by the Danish architect Jørn Utzon, who won an international competition for it in 1956.Its sail-shaped towers intend to reflect the original spirit of the harbour. The building was completed in 1973. Although called an opera house, it is a complex that contains a concert hall, a theatre for opera and ballet, a smaller theatre for plays, a recording hall and rehearsals rooms, and cinema. It is the home of the Sydney Symphony Orchestra, the Australian Ballet, and Australian Opera.