Sydney, capital of New South Wales and one of Australia's largest cities, is best known for its harbourfront Opera House, with a distinctive sail-like design. Massive Darling Harbour and Circular Quay are hubs of waterside life, with the towering, arched Harbour Bridge and esteemed Royal Botanic Gardens nearby. Sydney Tower’s 168m glass viewing platform, the Skywalk, offers 360-degree views of the city, harbour and suburbs. Sydney hosted over 1.8 million international visitors in 2013 or nearly half of all international visits to Australia. Sydney has been ranked amongst the top fifteen cities in the world for tourism every year since 2000. Popular destinations include the Sydney Opera House, the Sydney Harbour Bridge, Watsons Bay, The Rocks, Sydney Tower, Darling Harbour, the Royal Botanic Gardens, the Royal National Park, the Australian Museum, the Museum of Contemporary Art, the Art Gallery of New South Wales, the Queen Victoria Building, Taronga Zoo, Bondi Beach, the Blue Mountains, and Sydney Olympic Park.