Naked Science - Who Built Stonehenge?

Seizoen: 2004 - Aflevering: 4 / 21 - Eerst uitgezonden: 06 oktober 2004 - Episode ID: 412504

The general belief is that Druids built the ancient circle of stones. Recent archeological discoveries and new technologies reveal Stonehenge to have been built long before Druids arrived. Did the technology to build such a structure exist 4000 years ago?