In the book, it was implied that the tourists were sucked in by one of those roving guides who stand on street corners advertising spontaneous guided day-trips to historic places.
Those people actually do exist. If you go to the right part of NYC, every street corner will be filled with people shouting, "Purses, Prada, Gucchi, Coach" who, if you express interest, will take you into this warren of well-lit back rooms about a block away that are filled with designer knock-offs. Likewise, if you go to the right parts of Europe, there will be people with hand-written signs advertising 3-hour tours. I actually went on a ghost-walk in Prague like that.
Now, that doesn't explain why the large amounts of tourists going missing in Volterra have gone completely unnoticed, but it would be difficult to trace the disappearances back to that particular castle if the people hadn't really planned on going there.
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Those people actually do exist. If you go to the right part of NYC, every street corner will be filled with people shouting, "Purses, Prada, Gucchi, Coach" who, if you express interest, will take you into this warren of well-lit back rooms about a block away that are filled with designer knock-offs. Likewise, if you go to the right parts of Europe, there will be people with hand-written signs advertising 3-hour tours. I actually went on a ghost-walk in Prague like that.
Now, that doesn't explain why the large amounts of tourists going missing in Volterra have gone completely unnoticed, but it would be difficult to trace the disappearances back to that particular castle if the people hadn't really planned on going there.