Experts believe that Stonehenge may have been put together using a series of slots and holes, that has been compared to how Lego sets are built.
A rare photograph of the iconic monument shows an aerial view of one of the sarsen blocks, with markings similar to those of a mortise and tenon joint clearly visible.
Posted on social media by English Heritage, the accompanying caption states that the protruding lumps would have been used to connect with the holes – just like Lego.
Stonehenge, located near Amesbury, Wilts., is estimated to have been built around 3,000 BC.
English Heritage tweeted: "This is a rarely seen view of the top of one of the giant sarsen stones.
Read more from Yahoo News UK:
"The protruding tenons are clearing visible and the corresponding horizontal lintel stone would have had mortise holes for them to slot into.
"A bit like early Lego!"
A mortise and tenon joint functions by inserting one end of a piece of material – usually wood – into a hole in another piece.
The popular tourist spot is currently closed due to stop the spread of coronavirus.
The Lego Group began making its famous plastic interlocking blocks in 1949.