The national parks of New Zealand are 14 protected areas that are looked after by the Department of Conservation "for the benefit, use, and enjoyment of the public". These are popular among tourists, with 30% of tourists visiting at least one national park during their stay in New Zealand. While the national parks contain some of New Zealand's most beautiful scenery, the first few that were created were all focused on mountains. Since the 1980s more different kinds of New Zealand landscapes have been included in the national parks. New Zealand's national parks are all important to preserve both nature and culture, and some are also historically important. Tongariro National Park is one of 27 World Heritage Sites that is of both cultural and natural significance, and four of the South Island national parks form Te Wahipounamu, another World Heritage Site.