Watch Full Movie Online. On 20 October 1973, the Sydney Opera House was officially opened by Queen Elizabeth II. From conception to completion, it had taken more than 15 years and over $100 million dollars. In the years since its completion, the Sydney Opera House has become one of the most identifiable of Australia’s icons - ranking with the Sydney Harbour Bridge, Uluru, the koala and kangaroo - and is considered by many to be among the world's great architectural masterpieces.