Stonehenge is a mystical place. Its stone circles are probably more than 4,000 years old. The huge stones come from an area about 30 km north of Stonehenge. The smaller stones possibly are from the Preseli Mountains in Wales, almost 400 km away from Stonehenge.
Nobody knows for sure what the function of Stonehenge was. Maybe it was a druid temple. Maybe it was a sacrificial altar. Maybe it was some kind of observatory.