After 20 years, excavation work at Orkney's Ness of Brodgar will come to a close at the end of this week (16th August).Over the last two decades, this sprawling dig in the heart of Orkney's World Heritage Site has become one of the most important archaeological projects in the world. It has revealed a huge complex of Neolithic buildings covering three hectares, with more lying undisturbed across this ancient landscape.Finds have included beautiful decorated and painted stones, polished axe heads, carved stone balls, and even human and animal bones. But more than that, the excavation has changed the way we...