Why was Stonehenge built where it was?

It is a question that has haunted archaeologists and historians for generations. Why was Stonehenge built where it was?

A new dig a mile away from the World Heritage site has unearthed one of Britain's largest ever stone-age settlements.

And the people behind the project say it may help explain why the stones are where they are.

Our Wiltshire reporter Robert Murphy has been to the site.