Nielsen Park is a heritage-listed historic site, park and nature reserve located at Greycliffe Avenue, Vaucluse in the Municipality of Woollahra local government area of New South Wales, Australia. The traditional lands of the Birrabirragal indigenous people, the park was designed by John Frederick Hilly, James Barnet and the Office of the New South Wales Government Architect. It is also known as Vaucluse Estate, Greycliffe Estate and Greycliffe House. It was added to the New South Wales State Heritage Register on 28 August 2017. Nielsen Park is a part of Sydney Harbour National Park. It is a popular recreation area and beach, known as Shark Beach, on Port Jackson. The kiosk is dated from 1914. History Nielsen Park is part of the traditional land of the Birrabirragal Aboriginal people. The site was an attractive occupation site due to its accessibility, supply of fresh water and fishing resources. Extensive archaeological evidence at Nielsen Park demonstrates use of the land for camping and fishing over an extended period. To date there are 14 recorded Aboriginal sites within the park, each containing middens, rock shelters and various aesthetic pieces. Archival records attest to the continuing use of the land by Aboriginal people post-European contact. For example, during the Wentworth occupation of the site 1827-1911 Aboriginal people were recorded to be camping at the site. The recorded sites and potential unknown archaeological deposits link the Birrabirragal peoples of the past to Aboriginal peoples of the present. The landscape continues to be of cultural value for Aboriginal people. With the arrival of the Colonists the land comprising Nielsen Park went through several phases of private ownership. In 1793 Governor John Hunter made a grant to Thomas Laycock, Deputy Commissionary - General Quartermaster in the NSW Corps of . Three years later in 1797 the land was purchased by Capt. Thomas Dennett and named Woodmancote. Six years later in 1803 Sir Henry Brown Hayes purchased the land along with another 40 acres and together the lands formed the Vaucluse Estate. Hayes built a house and cleared the land; for cattle, orchards and vegetables. Hayes also leased the land to Samuel Breakwell who in turn leased it to Sir Maurace O'Donnell, who then leased it to Captain John Piper. Piper went on to purchase some of the estate until in 1827 his economic circumstances took a downturn and he sold the land to William Charles Wentworth who