Stonehenge is one of the world’s most famous monuments. It is a circle of huge stones in the south of England. People started making it 5,000 years ago, but they took over 1,000 years to build it. If you visit Stonehenge today, you will see many stones still standing, but it is a mystery how people brought them there. The stones are very heavy: the smaller stones are about 3,600 kilograms each, and the bigger ones are about 22,000 kilograms! Archaeologists believe that people carried some stones 32 kilometres, but it is possible that the bigger ones came from 225 kilometres away in Wales. They think that people carried the stones to a river and put them on simple boats. They then took them to the stone circle.