(Trying out @Joe Kerr's game format, and adding the rules.)
I'm thinking of a castle.
Remember you're no longer asking questions, you're directly guessing which castle I'm thinking about.
Rules:
You have 11 guesses (in total, not each)
Every guess must be an actual person/place/thing...
Actually, the only thing that wasn't stolen at the Louvre's Apollo Gallery is the Regent Diamond, figure no one would take it because something to do with a curse.