Stonehenge breakthrough reveals surprising path behind ancient stone’s 450-mile trek

For centuries, historians and archaeologists have debated how Stonehenge was built — and now researchers believe they may have finally traced one piece of the landmark's complex journey.

The monument, which sits on the Salisbury Plain near Amesbury, Wiltshire, was constructed in stages beginning around 3000 B.C., according to English Heritage, the organization that manages Stonehenge.

New research focuses on Stonehenge's Altar Stone, which sits near the center of the monument and has long been debated among scholars...