Hidden away, in the heart of the Scottish Highlands. A royal retreat - twice the size of the city of Manchester. The one place on earth where Queen Elizabeth can truly escape. The Queen treats Buckingham Palace as her office, Windsor Castle as her home and Balmoral as her bolthole away from it all. But the vast estate has witnessed some of the most dramatic moments in Royal history. In this series, we reveal how the lives of the Queen and her family have been shaped by this most secret royal home.