Garabandal, isn't that the one that predicts John Paul II is the last pope? If so, I guess we will be able to prove/disprove it in our lifetimes.
My understanding is that when Conchita, the main seer of Garabandal, was questioned about this particular prophecy, she took great pains to say that she and the other seers were not told it would be the end of the world or the last pope, just that the current pope will mark the end of our time. Conchita continues to maintain that she does not know the meaning of the phrase. IMO, it could mean something as simple as the end of the second millennium ... in which case, this particular prophecy is true.