Still standing in the parking lot, we are able to see the famous Tour Magdala. It was closed when we visited, so we were unable to take a look inside. The thing that struck me about it was that, with its belvedere that extends on the other side, it was very much like an "observation tower" more than anything else. Certainly, the belvedere was noting more than an open air terrace designed to enjoy the view.
Now, whether this observation was for nefarious purposes, or was simply constructed at the whim of Abbe Sauniere, for his leisure, can't be said for certain. But one thing that should be noted is that the Tour Magdala is a lot smaller than one would believe given the wild claims about it and its alleged construction costs.