The 14mm can be difficult to use - but it can capture an amazing perspective if done well. @lex on this forum has posted some amazing shots showing as much. We will spend a few days in the north of France, which is a beautiful place for landscape shots. My thought is to bust out the 14mm for that leg of the trip.
I'm really torn on whether I should bring the 24-105 or the 70-200. The former is a much better general purpose focal range and lighter to boot, but I have more fun lugging around the later and it's a faster lens.
Thank you for the advice so far!
You should check to see if the places you are staying will be able to secure your gear in the room. If so, then bring both the 24-105 and 70-200 and pack each day/trek for what you think you'll need. If not, then I'd be tempted to leave the 70-200 home. You can then use the 24-105 for outside/general usage, 14 for the ultrawide and 50 for dim indoor situations or for some shallow DOF portraits.