Researchers have discovered where the large stones in Stonehenge came from.
Stonehenge, in the southwest of England, is made of many large and small stones. The first section was built about 4,500 years ago.
Researchers have discovered that the large stones came from an area called West Woods in the Marlborough Downs, a group of hills about 24 kilometers north of Stonehenge. Until now, researchers thought this could be the location, but didn't know for sure.
Researchers discovered this after a piece of Stonehenge was returned 60 years after it went missing.
In 1958, three 1-meter-long sections were removed from the middle of one of the stones and replaced with metal to make the stone stronger. These three pieces of stone then went missing.
Robert Philips, 89, who did some of the work in 1958 and now lives in the US, had taken one of the pieces, but decided to return part of it in 2018.
This missing piece allowed researchers to test the stone and compare it with stones from the Marlborough Downs.
David Nash from Brighton University, who led the study, said that it had been exciting to use modern science to understand the past and learn where the stones came from, which researchers have been studying for centuries.
The two other pieces of stone are still missing. English Heritage, the charity that looks after Stonehenge, is asking people with information to contact them.
The smaller stones in Stonehenge come from the Preseli Hills in Wales, 240 kilometers away.
Researchers don't know what Stonehenge was used for, but many believe it was a temple.