In Italy, they're rolling out the red carpet as world leaders including U.S. Vice President Joe Biden begin arriving for Pope Francis' inaugural mass.

Vatican Communications Advisor Greg Burke

SOUNDBITE: Vatican Communications Advisor Greg Burke Saying:

"We are probably going to see crowds somewhat like when Pope John Paul II died, huge things, but the really interesting thing will be the people we don't see; all those people in Latin America getting up at five in the morning to watch it on television"

Those who did venture out in soaking rains for a peek at St. Peter's Square did so under the watchful eyes of security officers positioned all around.

Inside the Vatican, Pope Francis received a taste of home from President Cristina Fernandez --- mate, the traditional South American drink and a cup to drink it with. Tension about gay marriage --- specifically the pope's criticism of her support of it, were set aside --- as the new pontiff thanked her for