Australia has no official language, but most people speak English. There were hundreds of Aboriginal languages originally but many have become extinct. Australia has a diverse population due to immigration after World War 2. Architecture like the Sydney Opera House is iconic, and significant artists include Sidney Nolan. Early Australian films like The Story of the Kelly Gang were pioneering. The 1970s-80s saw films like Picnic at Hanging Rock gain international success. Cuisine was traditionally British but is now influenced by Mediterranean and Asian immigrants, and alcohol such as beer and wine are an important part of Australian culture.