George's tower does look crooked to me, by eye at full size, however; the lower two stages look vertical, compared to the edge of monitor frame in LyteBox, while the two levels above that increasingly seem to lean more to the right.
Might be severe pincushion distortion, or perhaps more likely; it really is that way, given the age and state of soil and foundations.
By the way, this place (in Windsor) is currently
for sale (only 1.5 million GBP) :)
http://www.pbase.com/dhumphries/imag...5/original.jpg
A bit of history on
Wikipedia
Cheers, Dave