park's indigenous sites include petroglyphs, art sites, burial sites, caves, marriage areas, birthing areas, midden sites, and tool manufacturing locations, among others, which are dated to be around 5,000 years old. The inhabitants of the area were the Garigal people. Other rock art sites exist in the Sydney region, such as in Terrey Hills and Bondi, although the locations of most are not publicised to prevent damage by vandalism, and to retain their quality, as they are still regarded as sacred sites by Indigenous Australians. The Australian Museum opened in Sydney in 1827 with the purpose of collecting and displaying the natural wealth of the colony. It remains Australia's oldest natural history museum. In 1995 the Museum of Sydney opened on the site of the first Government House. It recounts the story of the city's development. Other museums based in Sydney include the Powerhouse Museum and the Australian National Maritime Museum. The State Library of New South Wales holds the oldest library collections in Australia, being first established as the Australian Subscription Library in 1826. In 1866 then Queen Victoria gave her assent to the formation of the Royal Society of New South Wales. The Society exists "for the encouragement of studies and investigations in science, art, literature, and philosophy". It is based in a terrace house in Darlington owned by the University of Sydney. The Sydney Observatory building was constructed in 1859 and used for astronomy and meteorology research until 1982 before being converted into a museum. The Museum of Contemporary Art was opened in 1991 and occupies an Art Deco building in Circular Quay. Its collection was founded in the 1940s by artist and art collector John Power and has been maintained by the University of Sydney. Sydney's other significant art institution is the Art Gallery of New South Wales which coordinates the coveted Archibald Prize for portraiture. Contemporary art galleries are found in Waterloo, Surry Hills, Darlinghurst, Paddington, Chippendale, Newtown, and Woollahra. Entertainment Sydney's first commercial theatre opened in 1832 and nine more had commenced performances by the late 1920s. The live medium lost much of its popularity to the cinema during the Great Depression before experiencing a revival after World War II. Prominent theatres in the city today include State Theatre, Theatre Royal, Sydney Theatre, The Wharf Theatre, and Capitol Theatre. Sydney Theatre Company maintains a roster of local, classical, and international plays. It occasionally features