Stonehenge is perhaps the most famous prehistoric monument in the world. Begun as a simple earthwork enclosure, it was built in several stages, with the unique lintelled stone circle being erected in the Neolithic period in around 2,500 BC. Stonehenge remained important into the early Bronze Age (2,200–1,500 BC), when many burial mounds were built nearby. Today, Stonehenge, together with Avebury and other associated sites, form the heart of a World Heritage Site with a unique and dense concentration of outstanding prehistoric monuments.
