Overview: Holdenby House in Northamptonshire was once one of the largest palaces in England and was also a prison for King Charles I in the mid-1600s. Today, it's the home of James and Karen Lowther, who over the years have invested millions on restoring it to its former glory and preserving it for future generations. Julie Montagu, Viscountess Hinchingbrooke visits the 2,000-acre estate and 75-room country house, where she gets a lesson in music, falconry, and how to keep an aging home aesthetically pleasing and profitable.