One person suggested there was a demonic presence entering through one of the spires (no, that's just the golden madona protecting her subjects, and reflecting the last few rays of sunlight!). A couple of people thought it strange that McDonald's had space in the Duomo, but those "M" signs are for the "Metro" underground subway station, not for hamburgers. One person thought the photo had been reversed into a negative image... no, nothing that complicated...
Those of you who got it right know who you are (SS, CF...): there's one lightbulb in a streetlamp that is conspicuously unlit in the foreground.
Thanks for playing!
-Rob
PS: Don't forget the bonus pictures...