The Royal Tasmanian Botanical Gardens, which cover an area of approximately 14 hectares (34.6 acres), were established in Hobart in 1818 and are located within the Queens Domain. The Gardens hold historic plant collections and a large number of significant trees, many dating back to the nineteenth century. It also has an increasing number of important conservation collections of Tasmanian plants, of which the King's Lomatia is one of the most unusual, and the world's only Subantarctic Plant House. Here, plants from subantarctic islands in high southern latitudes are displayed in a climatically-controlled environment, where chilly fogs and mists mirror the wet, cold conditions of their island homes.