tuesday morning, very early tuesday morning. we're, obviously, in front of st. peter's so we can keep watch on the sistine chapel, where later today the men who elect the next pope won't even be able to get a cell phone signal out. 115 cardinal electors will be so far off the grid, they'll be sending out smoke signals instead of instant messages. but for all of the talk of the shrouded secrecy and the penalties for piercing it, we do know a bit about the way papal conclaves have gone in the past and we know a lot about the way it looks and sounds like inside the sistine chapel. tom foreman takes us inside tonight a remarkable computer simulation. >> as you know, anderson, the sistine chapel is one of the most visited and open places in all of europe. on any given day, thousands of tourists streaming through here, especially to see the amazing fresco painted by michael deangelo in the 1500s to depict the creation of man. but now this has been transformed into one of the most private and secretive places in all of europe, because this is where the cardinals will select