Sir Trevor McDonald and Julia Bradbury countdown and celebrate our top 20 favourite national treasures in Britain from iconic buildings and ancient monuments to breathtaking natural coastal and countryside wonders and awe-inspiring feats of engineering - but which will claim the number 1 spot? Each location offers privileged access into the much loved landmarks and spectacular sights while fans and famous faces share their personal memories and passion for what makes each to special to them. The countdown is based on a major new survey [commissioned by ITV and conducted by YouGov], to discover the country’s favourite sites and iconic landmarks from a shortlist drawn up in conjunction with the National Trust, the English Heritage and others. Britain’s National Treasures reveals new stories and insights as it counts down. These include after years of delivering the News at Ten following the clock’s famous “bongs”, Sir Trevor McDonald gets up close to Big Ben for the first time in his career, The Chase's Jenny Ryan explains that it was the British Museum that drove her insatiable appetite for knowledge, Eamonn Holmes recalls childhood excursions to the Giant’s Causeway and comedian Hugh Dennis reveals that his father was Prebendary of St Paul’s Cathedral.