Stonehenge is a prehistoric, mysterious circle of upright stones in southern England. It consists of roughly 100 massive standing stones, with each is around 4 meters high and weighing around 25 tons. Research shows that the site has continuously evolved over a period of about 10000 years. The structure of the famous stones that still stand today was built about 4000 years ago and was one part of a larger sacred landscape that included a massive stone monument that was 15 times the size of Stonehenge. Many theories have been put forward so to why Stonehenge was constructed. The stones are aligned almost perfectly with the sunrise on the summer solstice, and it is very possible that Stonehenge was built as a spectacular place of worship. Stonehenge is one of the wonders of the world and the best-known prehistoric monument in Europe.