The United Nations Educational, Scientific and Cultural Organization (UNESCO) World Heritage Sites are places of importance to cultural or natural heritage as described in the UNESCO World Heritage Convention, established in 1972. Cultural heritage consists of monuments, groups of buildings, and sites. Natural features, geological and physiographical formations, and natural sites which are important from the point of view of science, conservation or natural beauty are defined as natural heritage. The United Kingdom ratified the convention on 29 May 1984, making its sites eligible for inclusion on the list.