While I understand your point, the Pentagon photo provides a pretty clear sense of scale. I mean, we have something equally the same distance away in the picture, and the plane seems incredibly small. I know that the pentagon is a big building, but assuming that each of its five stories is 20 ft. high, then the plane appears to be like fifteen feet tall.

Actually, there was a report somewhere that listed the height of the Pentagon and the height of a 767 and it didn't seem to match what was in the photo.

Of course, I could be wrong.