Stonehenge is a Neolithic and Bronze Age monument located near Amesbury in the English county of Wiltshire, about 8 miles (13 km) northwest of Salisbury. It is composed of earthworks surrounding a circular setting of large standing stones, known as megaliths. There is some debate about the age of the stone circle, but most archaeologists think that it was mainly constructed between 2500 BC and 2000 BC. The older circular earth bank and ditch, which constitute the earliest phase of the monument, have been dated to about 3100 BC.
The site and its surroundings were added to the UNESCO's list of World Heritage Sites in 1986. It is also a legally protected Scheduled Ancient Monument.