Cathedral column rising up to the 10 story high ceiling. Lining up this shot was harder than I would have thought. Of course the awkward camera angle (awkward if you've got to look up through the viewfinder with a low camera) didn't help. Things are mostly in line and straight - not perfect, but good enough. An incandescent light near the top left was troublesome.
The perspective is tricky. The three "curvy pieces" coming in from each side about 1/3 down the frame from the top are less than 1/2 of the way up.