Aubrey holes, Neolithic chalk pits in the United Kingdom
Aubrey holes are a circle of 56 pits at Stonehenge, believed to have held timber posts or stones.
Named after John Aubrey, who identified the Aubrey holes as ancient in the 17th century.
The function and importance of these holes are valued differently among archeologists and historians.
Scientific study of the Aubrey holes has informed understanding of Neolithic people.
Some theories suggest the Aubrey holes were used for astronomical observations.
Source: Wikimedia