Digging up the past at ancient stone circle Date: 02 July 2008 By John Ross WORK will start next week to unearth the secrets of one of Europe's most important prehistoric sites. The Ring of Brodgar in Orkney, the third-largest stone circle in the British Isles and thought to date back to 3000-2000BC, is regarded by archaeologists as an outstanding example of Neolithic settlement and has become a popular tourist attraction in the islands. It is believed it was part of a massive ritual complex but little is known about the monument, including its exact age or purpose. It is...