Maybe there was also a Icehenge and an Airhenge? I think we've found M. Night Shaymalan's next script or at least its inspiration.in reference to:
"Like Stonehenge itself, the structure's precise purpose remains a mystery. But it's one of an expanding number of discoveries being made around the site – something experts say is helping to show that Stonehenge was once much more than just a cluster of sandstone blocks standing in an empty field."
- Stonehenge Discovery: Wooden Monument Found Near Stone Ciricle (view on Google Sidewiki)