Near the center of the roughly 5,000-year-old circular monument known as Stonehenge is a six-ton, rectangular chunk of red sandstone. In Arthurian legend, the so-called Altar Stone was part of the ...

The Altar Stone, the largest of the bluestones used to build Stonehenge, lies at the heart of the ancient monument in southern England. The 13,227-pound (6-metric ton) block was likely transported ...

As the quest to find the origins of Stonehenge’s Altar Stone heats up, researchers rule out one Scottish site that appeared to have a direct link to the monument.