Stonehenge is a mysterious place. Nobody knows exactly who built the monument on Salisbury Plain. The construction was begun about 5000 years ago, so it is one of the oldest buildings in existence.
There are three circles of stones and some of the stones are very heavy. The extraordinary thing is that a lot of them were brought from places far away. People didn´t have transport in those days, so how did they move them? It is a mystery.
The legend says that Stonehenge was built for sunworshipping but there are different theories as to why Stonehenge was built. Some people think it was a castle, others an observatory from which to watch the stars, and still others a calendar in stone. Speculation on the reason it was built range from human sacrifice to astronomy.
Stonehenge has many visitors every year. It is very popular in the Summer. On June the 21st of every year, the longest day of the year, the sun rises directly above a line drawn between two of the most important stones, and there is a ceremony of sunworshipping at sunrise on Midsummer´s day. People stand inside the sacred circle and there is an amazing excitement at the solstice sunrise.
http://channel.nationalgeographic.com/episode/stonehenge-decoded-3372