Scientists say they've uncovered how Stonehenge was built and where the stones were from. The theory is that the site was constructed by a teenager and 3 children from Wales and they carried the stones (which are HUGE, by the way) 240 miles from the quarry to where they set up the circle of rocks now known as Stonehenge. You know what? This theory doesn't hold up. A teenager and 3 children? Huge bluestone slabs? 240 miles? Nope.