The counties of Kildare, Meath and Wicklow are part of the Greater Dublin Area. Many of Dublin's workforce live here and the capital of Ireland has had an important effect on this area, bringing prosperity and modernisation to the region. Despite the region's proximity to Ireland's largest city (Dublin), there is much to do and see here all within easy reach of Dublin. The Wicklow Mountains which lies just to the south of Dublin City is Ireland's largest upland region. The national park here is ideal for home to much of Ireland's wildlife as well as some important heritage sites including Glendalough. The Boyne Valley, a UNESCO World Heritage Site in County Meath, is perhaps the most important area of historical importance in Ireland. Here you can see the enormous megalithic burial tombs around Newgrange, older than the Pyramids of Egypt; and the Hill of Tara, the ancient seat of the High Kings of Ireland. Ireland's largest Castle, Trim Castle which dates from the 12th Century AD dominates much of County Meath. Some of Ireland's finest country houses are located in Dublin's neighbouring counties of Kildare, Meath and Wicklow. Castletown House, Carton House, and Russborough house are among the best examples.