Conservation Areas are areas of architectural or historic interest. They were first introduced in England in 1967 in recognition of the fact that the quality of historic areas depends not only on the quality of individual buildings but also on the historic layout of properties, the use of characteristic building materials, public spaces, trees, views between buildings and along streets. There are 42 designated Conservation Areas in the National Park. Reviews of Conservation Areas are carried out periodically. If significant change has occurred or if additional areas of special interest are identified, then changes to the boundaries of Conservation Areas may be proposed and consulted on. Conservation Areas are recorded as a polygon. Some Conservation Areas are only partly in the National Park, the District Council should be contacted for the areas of these CA not in the National Park.