Wynstay Estate is a heritage-listed farm located at 68-78 The Avenue, Mount Wilson in the City of Blue Mountains local government area of New South Wales, Australia. It was designed by Richard Wynne and built from 1875 to 1893 by Joseland and Gilling; Turkish Bath house by Earnest A. Bonney. It is also known as The Turkish Bath. The property is privately owned. It was added to the New South Wales State Heritage Register on 12 April 2002. History In 1833 William Romaine Govett completed his survey of 'the mountain ranges immediately to the north of Bell's Ridge' in which he described Mount Wilson as "high mass of range of the richest soil and covered with impenetrable scrub". In 1868 Surveyor E. S. Wyndham completed his survey including 62 portions situated at Mount Wilson, Parish of Irvine, County of Cook. Richard Wynne is listed in 1870 as living at Wynstay on Liverpool Road, Burwood between Drivers Road and Alt Street. After an attempted sale by auction in April 1870, Wynne purchased six allotments of Wyndham's subdivisions between 1875 and 1876. In 1875 Richard Wynne completed his first term as Mayor of Burwood and that year built a cottage on his property at Mt. Wilson. Between 1876 and 1878 Wynne appears to have built a second, larger house called Yarrawa, which burned down in 1906. A photograph of this second house held by the Mount Wilson & Mt. Irvine Historical Society was taken by Bischoff, a photographer with Eccleston du Faur's expedition in the Grose Valley, dating it to well before 1893. During this period Wynne is said to have employed a stonemason, John Rowland. The stables, gate lodge, the timber house now known as Old Wynstay and much of the crenulated stone walls were completed. Between 1875 and 1879 the road towards Mount Irvine was resurveyed to skirt the top of the hill on which Wynstay now stands, presumably because the road surveyed by Wyndham was too steep. On 3 September 1879 the redundant section of old road, was purchased by Richard Wynne as the gates, Old Wynstay and much of the crenulated walls are located on this land. In 1880 the name Yarrawa appears to have still been in use. Henry John Wynne (Richard Wynne's son) acquired portion 64 to the north of the old road by Crown grant in 1882. By this time, the portion was bisected by