Somber, still, and timeworn, Stonehenge looms large in humanity's mythos – an ancient, enigmatic monument that has stood sentinel over southern England for millennia. Who built it and why are questions that have mystified us for hundreds of years. And in 2024, the mystery of the 5,000-year-old monument deepened. Scientists revealed that Stonehenge's Altar Stone – a mostly buried, 6.6-ton block of grayish-green sandstone – hailed from the far north of Scotland , some 700 kilometers (435 miles)