city to witness this historical moment. >> i thought that was absolutely incredible. >> it is quite incredible, that they're that committed to be here on this day. so, as you'd imagine, this is a very emotional and solemn time as people there gather to honor two rock star popes, pope john paul ii and john xxiii. >> and delia telling us that the message here, if there's one overarching theme, is one of mercy. >> right. >> that pope francis seems to be showing and demonstrating with all of these acts, even with acts that he's taken during this past year, his first as pope. whether it's washing people's feet, calling nuns to see how they are. he spoke with a woman, called her in argentina last week, a woman married to a divorced man, saying you can still be a part of the church, even though it goes against some of the rules. but really, his message seems to be with this recognizing the two pillars of the catholic church together. and then also being alongside