Even the cruise ships won't dock in Rome today. Not only is it Labor Day all over Europe, but it is also the day of beatification for Pope John Paul II and the crowds are expected to be formidable.
If you, too, wonder exactly what beatification means to Catholics, here's the definition from Wikipedia that helped David and I understand its significance.
Beatification (from Latin beatus, blessed, via Greek μακάριος, makarios and Latin facere, make) is a recognition accorded by the Catholic Church of a dead person's entrance into Heaven and capacity to intercede on behalf of individuals who pray in his or her name (intercession of saints). Beatification is the third of the four steps in the canonization process. A person who is beatified is given the title "Blessed." --Wikipedia
David and I think it's probably a good day to explore the Jewish Ghetto.