Stonehenge, Avebury and Associated Sites is a UNESCO World Heritage Site in Wiltshire, England. The WHS covers two large areas of land separated by about 24 kilometres, rather than a specific monument or building. The sites were inscribed as co-listings in 1986. Some large and well known monuments within the WHS are listed below, but the area also has an exceptionally high density of small-scale archaeological sites, particularly from the prehistoric period.