Mount Vernon tuberculosis sanatorium was in operation between 1915 and 1949 (The Welcome Trust 2007 [accessed 3/1/08]). The modern hospital complex that is still in use on the site replaced the original buildings in the mid to late 20th century. Prior to the development of the hospital there was a large house on this site that was likely to have been an elite residence. The date of origin of the large house is uncertain but this area was probably still part of the commons between Barnsley and Worsbrough until the post-medieval period. There is fragmentary legibility of the former residence in the surviving plantation woodland along side the hospital and the boundaries of the site.