 The Vaucluse Site is significant because it is an example of a designed "Picturesque" landscape, including fountain and shrubbery, of the colonial period belonging to a prominent colonial family; it contains remnants and features of a "gardened site" begun in 1804 and shows the development of gardening styles, taste and necessity over fifty years; and it has strong association with the Wentworth family such as the Mausoleum and Greycliffe House.The place is important in demonstrating aesthetic characteristics and/or a high degree of creative or technical achievement in New South Wales.The Vaucluse Site is significant because it provides the opportunity to demonstrate the architectural and functional interdependence of house, estate buildings and landscape setting in a colonial rural estate and therefore enables an understanding of the social and cultural values of the owners and their period.