What does the Great Barrier Reef have in common with the Great Wall of China, the Great Smoky Mountains National Park and the ruins of Zimbabwe? All four of these places - and over a thousand others - are on UNESCO's World Heritage List. According to the United Nations body, this makes their protection the common goal of humanity. Australia has 19 World Heritage sites, dominated by 16 natural sites, while four of these are joint natural-cultural entities. Six are at least partly in New South Wales. Find out more.