eric: the pontiff looking rested despite having returned from his historic tour through mexico and cuba, greg burke is streaming live from rome. a special sunday morning. reporter: eric, that s right, you know, it is all leading up to next sunday, today is the big day, the official start of the holest week on the christian calendar, in fact called holy week for that reason. now, pope benedict xvi celebrating mass in st. peter s square for the occasion, an st. peter s square, decked out to commemorate christ s triumphal entry into jerusalem and the pope telling pilgrims they have a crucial question to ask themselves, who is jesus of nazareth for me and laying out a challenge to put christ at the center of their lives, saying this is the way to true joy. now, there was a huge crowd here, this morning, while massive numbers of people come to rome, all year, those who are here, this week are really here