"We have received an answer to a question that has eluded archaeologists for 400 years"

- Finally, we have the answer to the question that archaeologists have been asking for so long: Where do these stones come from? says Susan Greaney, archaeologist.

In the late 1950s, an employee of a company that worked on the restoration of Stonehenge received a unique souvenir.

A stone cylinder, about a meter long, extracted from one of the monument's broken blocks. The man returned the cylinder to British researchers in 2018, which meant that it could be examined and the origin determined. 50 of the 52 boulders come from a site 25 kilometers from Stonehenge.

- Each block weighs between 20 and 30 tons. From the beginning, about 80 pieces stood here, says Susan Greaney, archaeologist.

This means that a big question remains: How were the huge boulders transported to the site in the 25th century BC?