I have heard that you cannot take pics inside because flashes from camera can damage the art work, like the ceilings of the Sistine Chapel.
Other - Italy - 4 Answers
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1 :
I was just there and you can take pictures inside the Vatican with flash. However no pictures are allowed the Sistine Chapel (you are not even allowed to talk in there). --We did sneak one without flash. The Vatican is amazing. Get there early b/c the line is so long to get in.
2 :
yess this is true. i went a couple years ago. you are alloweed to take pictures inside st. peters basilicca but not inside the museam cause the flashes could ruin the pictures.
3 :
Yes you can. Just don't use flash. You are not supposed to take pictures in the Sistine Chapel but I managed to snap off a dozen or so. Just be discreet and don't use flash. You need a steady hand when you are not using flash, as the exposure time will be a second or so longer. Here are some pictures I took at the Vatican, in Rome and Europe. http://www.flickr.com/photos/60178917@N00/
4 :
Correct!!!!!! In many museums you can not take any pictures.