Australia, one of Australia's oldest scientific and cultural institutions. Conceived and developed initially along the contemporary European model of an encyclopedic warehouse of cultural and natural history, the museum buildings evolved as the institution evolved, partly in response to its visiting public, to pursue and expand knowledge of the natural history of Australia and the nearby pacific region. The museum continues to occupy the site provided, and the building constructed, as its first permanent home, commenced in 1846 and opened to the public in 1857. The extended and enlarged complex of buildings which now provide its principal exhibition, administrative and research accommodation reflect the growth of the institution and its prestige, as well as the evolving attitudes of Australian Government and society to science and research. The Museum's various buildings further comprise a unique aggregation of work by successive colonial and Government Architects of New South Wales, exhibiting: changes in the philosophy and functional requirements of museum design changing stylistic influences and design approaches in architecture from the early 19th century to the present, and corresponding developments in building technology, materials and craftsmanship. Individually the various elements of the Museum complex remain significantly intact, with potential for enhancement of their cultural significance through conservation techniques, though conflicts exist between conservation of fabric and contemporary use, particularly exhibition techniques. Of special note are the exteriors and principal interiors of the three earliest wings of the complex, which despite varying degrees of alteration, remain in substantial original condition. The interlinked exhibition galleries comprise an important group of 19th and early 20th century public interests. Through its development, the Museum complex has assumed a prominent stature in the townscape of Sydney. With its frontage to William and College Street, the Museum commands the eastern reaches of Hyde Park and forms and extension of the principal historic civic and religious precincts adjoining the northern boundaries of the park in Macquarie and College streets. Through recent expansion the museum site includes the former grounds and two surviving buildings of the William Street National School, which, established in 1851, is one of the earlier public schools continued in educational use for almost 100 years. Australian Museum was listed on the New South Wales State Heritage Register on 2 April 1999. 2020 Upgrade At the end of 2020, after being closed for 15 months, the 200 year old Museum re-opened following a major upgrade. Subsequent to its