The archaeological excavation of the site was begun under the supervision of John Richard Walbran, a Ripon antiquary who, in 1846, had published a paper On the Necessity of clearing out the Conventual Church of Fountains.[19] In 1966 the Abbey was placed in the guardianship of the Department of the Environment and the estate was purchased by the West Riding County Council who transferred ownership to the North Yorkshire County Council in 1974. The National Trust bought the 674-acre (273 ha) Fountains Abbey and Studley Royal estate from North Yorkshire County Council in 1983.[20] In 1986 the parkland in which the abbey is situated and the abbey was designated a World Heritage Site by UNESCO. It was recognised for fulfilling the criteria of being a masterpiece of human creative genius, and an outstanding example of a type of building or architectural or technological ensemble or landscape which illustrates significant stages in human history. Fountains Abbey is owned by the National Trust and maintained by English Heritage. The trust owns Studley Royal Park, Fountains Hall, to which there is partial public access, and St Mary's Church, designed by William Burges and built around 1873, all of which are significant features of the World Heritage Site.[21]
