According to archeologists, ground-radar imaging is showing a second, wooden version of Stonehenge not far from the original stone version. Although they've rotted long ago, the imprint of huge wooden posts is still there.
(photo from the official Stonehenge website, where you can learn much more about this mysterious spot.)
Find out more here, including details about the 4,600-year-old ruins -- including hearths and building foundations. It's thought to be the largest Neolithic village site found yet in Britain. (The conjecture: this is where the villagers who were constructing the Stonehenge site lived.) The CNN version of this story will show you grainy images of the wooden circle, as documented via magnometer.