The skeleton of the Gare du Nord trainstation in Paris. Could be family to a cathedral...
Manually aligned in Gimp - 3 exposures (0, -2, +2) blended. Some lens correction(Gimp plugin again) to account for the DA16-45mm distortion at 16mm and a wide crop to eliminate the uninteresting ceiling.
It was the apparent symmetry that drew me and I spent minutes lining it up so that the symmetry would show. Even then, I ended up tilting the camera to the right a bit (which I have a tendency of doing all the time - crooked horizons are my bane) so I had to measure up the angle and then rotate the picture by about half a degree.
This is just a train station's far end, where the trains actually roll out from under the roof but the similarity to grand churches/cathedrals was striking and the light helped - gloomy inside, bright early evening sky outside.
I'd appreciate your thoughts.