Scotland has a lost archaeological history - the ruins of thousands of townships and buildings which have never been recorded on any map, yet which tell the tale of life in a period of dramatic change. Mark Stephen follows attempts to uncover those stories before the buildings fade from the landscape. On the Balmoral Estate, Mark meets a ranger who was astounded to learn that what he though was just a pile of stones was in fact the remains of a once-thriving farming township. And he follows a drovers road between two glens, discovering the remnants of a lost way of life. Producer Monise Durrani.