The site, known as the Ness of Brodgar, was investigated by BBC2 documentary A History of Ancient Britain, with presenter Neil Oliver describing it as 'the discovery of a lifetime'. So far the remains of 14 Stone Age buildings have been excavated, but thermal geophysics technology has revealed that there are 100 altogether, forming a kind of temple precinct. Until now Stonehenge was considered to have been the centre of Neolithic culture, but that title may now go to the Orkney site, which contains Britain's earliest known wall paintings. Oliver said: 'The excavation of a vast network of buildings on...