Is the Vatican a target? The story has no evidence that it's a target, but theoretically, it makes sense that it'd be on the list. Link. Excerpts:
"I think the Vatican has to be considered a target because Al Qaeda has said that the Vatican is a target," said Kishore Jayabalan, a former Vatican official, now of the Acton Institute. "One of the things the Vatican has tried to do is to downplay the differences between Islam and Christianity." . . .
Aside from its symbolic importance, the Vatican is seen by some as a potentially strong temptation for terrorists simply because it attracts so many tourists. The Vatican's museums had more than 3.5 million visitors last year.
This summer, a record 23,000 people visited in a single day.