buildings, parks and gardens are graded on a scale, Grade I being internationally significant sites are therefore the most important and constitute around 10% of the total number. Historically important gardens are Grade II* (about 30% of the total) and the remainder are of regional or national importance and are Grade II registered. Other parts of the United Kingdom Separate registers of parks, gardens and designed landscapes are maintained in the other countries of the United Kingdom: The Cadw/ICOMOS Register of Parks and Gardens of Special Historic Interest in Wales is maintained by Cadw The Inventory of Gardens and Designed Landscapes in Scotland is maintained by Historic Scotland The Register of Parks, Gardens and Demesnes of Special Historic Interest is maintained by the Northern Ireland Environment Agency See also List of sites on the National Register of Historic Parks and Gardens Historic England List of English Heritage properties List of heritage registers Historic garden conservation References External links National Database by Parks and Gardens UK Historic England: Registered Parks and Gardens Article about the Register Cadw/ICOMOS Register of Parks and Gardens of Special Historic Interest in Wales Guide to historic garden and heritage conservation Garden History Society . National Heritage List for England Listed parks and gardens in the United Kingdom Gardens in England Parks in England Heritage registers in England Historic England Garden design history of England Government agencies established in 1983 1983 establishments in England