 St Kilda is the only mixed World Heritage Site in the UK.Originally preserved for its natural habitats alone, in 2005 the site was expanded to include the crofting community that once inhabited the archipelago; the site became one of only 25 mixed sites worldwide.The natural sites are the Dorset and East Devon Coast; Giant's Causeway and Causeway Coast; Gough and Inaccessible Islands; and Henderson Island.