One true fact that I am aware of is that.....Next time you pass, look just above street level and you will see diamond and circular glass shapes embedded into the stone work. These are flagon bottles of what was Gin consumed by the Irish builders during it's construction. When empty, they were placed neck first into the bricks for decoration. See the Picture Sheffield link. Another true fact is that the largest iron billet ever cast ( and it was huge ) was placed as part of the bed of Gibr