Measuring a massive 24ft/7m by 15ft/4.5m and weighing around 40 tons (as much as an articulated lorry), how on earth did the builders get it up there?
A’r maen hwnnw’n mesur 24 troedfedd/7m enfawr wrth 15 troedfedd/4.5m ac yn pwyso rhyw 40 tunnell (cymaint â lori gymalog), sut ar y ddaear y llwyddodd yr adeiladwyr i’w gael i fyny?