Restoration is a tricky one. All the stones that Le Rouzic re-erected at Carnac have an inch square of pink concrete stuck to them near the base. They're barely noticeable but when you do see them you realise just how many were re-erected. Would the Carnac alignements be as impressive if he hadn't done it?
Similarly with 'show sites' like Newgrange and the Table des Marchants at Locmariaquer. Both Disney recreations, but both a useful tool in their way for seeing how these types of site would have looked.
Not sure about 'I woz 'ere' lintels though;-)