Most of Scotland's castles, whether ruined or occupied, remain in private ownership, though many are open to the public at least occasionally. During the twentieth century a number of older castles were transferred into the care of the state, and these are now the responsibility of Historic Scotland, which was created as an agency in 1991. Historic Scotland cares for over 300 properties – all of which are publicly accessible – including around 65 castles. These include some of Scotland's most famous castles including Edinburgh and Stirling, as well as numerous tower houses and ruined castles. The National Trust for Scotland (founded 1931) cares for several post-Medieval castles and estate houses, including Culzean and Craigievar that were still in occupation until the twentieth century. The Landmark Trust restores and operates historic buildings as holiday homes, including Saddell Castle, Castle of Park and Roslin Castle. Several other castles are in the hands of local government, for example Dudhope Castle in Dundee, and some are maintained by building preservation trusts and other charitable bodies, for example Sauchie Tower, Clackmannanshire.