Five years after a ruinous fire, the reopening of the cathedral restored it in full glory to the Paris skyline and delivered a much-needed morale boost for France.

The word "Merci" was projected on to the front of Paris' Notre-Dame cathedral as it reopened on Saturday, in thanks for its salvation after a devastating fire that brought the 860-year-old building close to collapse five years ago.

Donald Trump and Dr. Jill Biden were among others invited to the grand re-opening of Notre Dame Cathedral. It's the president-elect's first international engagement since his election victory. First Lady Dr.