The Notre Dame Cathedral in Paris is a spectacular building. Its architecture is spellbinding, and its stained-glass windows and splendid interior features are breathtaking. But after centuries of standing sentry over the Paris landscape, it is falling apart. Time and pollution have taken their toll, and it is time for this glorious structure to be repaired.

So the people who love this eight-century-old landmark are coming to its rescue. In a recent year, the French government set aside more than six million dollars to help restore the church. Its supporting flying buttresses must be shored up. Many of its exterior stonework…