When the Duke and Duchess of Cambridge were married at Westminster Abbey in April 2011, they followed a long line of British royal weddings. However, their wedding would have been seen by more people than any other. Although the Abbey was full to its 2,200 capacity, nearly a billion people worldwide tuned in to watch live coverage or news highlights of the wedding.
Elizabeth II's sister HRH The Princess Margaret was married here in 1960 and of the current Royal Family, HRH The Princess Alexandra, HRH The Princess Royal and HRH The Duke of York were all married on the steps of the High Altar.
In all, 16 royal weddings have taken place in the Abbey and the tradition goes back nine hundred years - to Henry I who married Princess Matilda of Scotland in 1100.
At different times of the day, or in different seasons, the light falling in the Abbey will light up something that you have walked past a million times and never seen before.