This programme follows the relocation of the biggest, heaviest and least mobile historic structures imaginable. We'll see the crucial planning process - how the movers measure size, weight, weather, traffic and clearance - knowing that one mistake can mean disaster. We'll hold our breath during the chilling first lift, as the creaks, cracks and groans signal the hoisting of an 800 ton building onto some 20 sets of dollies. We'll follow the dangerous journey, navigating over narrow bridges, avoiding power lines, turning sharp corners, all the while hoping the structures don't break apart. Always adding to the challenge is Mother Nature, who likes to throw in surprises - like spring mud, summer thunderstorms, floods and hurricanes.