Secrets Of The National Trust The National Trust is opening its doors to Channel 5 for the first time. Secrets of the National Trust explores stunning estates, historic houses and miles of breath-taking landscapes and coastlines. The six-part series highlights the conservation work of the National Trust and showcase their spectacular buildings and gardens from across the UK. Viewers will gain a rare perspective of some of Britain's most valuable heritage sites and discover hidden treasures that are often unseen by the public